fix broken links

docs/about.md

@@ -31,7 +31,7 @@ Just like Arduino, the micro:bit can be connected to and interact with sensors,
 
 ## Blocks or JavaScript
 
-The student can program the BBC micro:bit using Blocks or JavaScript.
+The student can program the BBC micro:bit using [Blocks](/blocks) or [JavaScript](/typescript), via the [micro:bit APIs](/reference):
 
 ```blocks
 basic.showString("Hi!");
@@ -41,7 +41,7 @@ basic.showString("Hi!");
 
 When a user has her code ready, she can connect her BBC micro:bit to a computer via a USB cable, so it appears as a mounted drive (named MICROBIT). 
 
-Compilation to the ARM thumb machine code happens in the browser.
+Compilation to ARM thumb machine code from [Blocks](/blocks) or [JavaScript](/typescript) happens in the browser.
 
 The student is prompted to save the ARM binary program to a file, which she then simply drags to the micro:bit mounted drive, 
 which flashes the micro:bit device with the new program.
@@ -56,7 +56,7 @@ The simulator has support for the LED screen, buttons, as well as compass, accel
 The [C++ BBC micro:bit runtime](http://lancaster-university.github.io/microbit-docs/), created at [Lancaster University](http://www.lancaster.ac.uk/), provides access to the hardware functions of the micro:bit, 
 as well as a set of helper functions (such as displaying a number/image/string on the LED screen). 
 
-The JavaScript micro:bit library mirrors the functions of the C++ library. 
+The [micro:bit library](/reference) mirrors the functions of the C++ library. 
 When code is compiled to ARM machine code, the calls to JavaScript micro:bit functions are replaced with calls to the corresponding C++ functions.
 
 ## Open Source

docs/blocks/logic/if.md

@@ -3,7 +3,7 @@
 ### @parent blocks/language
  
 
-Conditionally run code depending on whether a [Boolean](/reference/types/boolean) condition is true or false.
+Conditionally run code depending on whether a [Boolean](/blocks/logic/boolean) condition is true or false.
 
 ```blocks
 if(true) {
@@ -24,5 +24,5 @@ If the [light level](/reference/input/light-level) is `< 100`, this code sets th
 
 ### See also
 
-[while loop](/blocks/loops/while), [for](/blocks/loops/for), [boolean](/reference/types/boolean)
+[while loop](/blocks/loops/while), [for](/blocks/loops/for), [boolean](/blocks/logic/boolean)
 

docs/blocks/loops/while.md

@@ -1,16 +1,13 @@
 # While
 
-### @parent blocks/language
- 
-
-Repeat code while a [Boolean](/reference/types/boolean) `condition` is true.
+Repeat code while a [Boolean](/blocks/logic/boolean) `condition` is true.
 
 ```blocks
 while(true) {
 }
 ```
 
-The while loop has a *condition* that evaluates to a [Boolean](/reference/types/boolean) value. After the `do` keyword, add the code that you want to run while the `condition` is `true`. The while loop concludes with `end while`.
+The while loop has a *condition* that evaluates to a [Boolean](/blocks/logic/boolean) value. After the `do` keyword, add the code that you want to run while the `condition` is `true`. The while loop concludes with `end while`.
 
 The condition is tested before any code runs. Which means that if the condition is false, the code inside the loop doesn't execute.
 

docs/lessons/counter.md

@@ -34,7 +34,7 @@ basic.showLeds(`
     `)
 ```
 
-* **variable**: [read more...](/reference/variables/var)
+* **variable**: [read more...](/blocks/variables)
 * **arithmetic operators**: [read more...](/reference/types/number)
 * **on button pressed** : [read more...](/reference/input/on-button-pressed)
 * **show number** : [read more...](/reference/basic/show-number)

docs/lessons/headbands.md

@@ -42,19 +42,18 @@ Learn how to create a charades game with **collections**, ` create -> Collection
 ## Documentation
 
 * **collection**
-* **global variables** : [read more...](/reference/variables/globals.md)
-* **Boolean** : [read more...](/reference/types/boolean)
-* **on logo up** [read more...](/functions/on-logo-up)
-* **on screen down** [read more...](/functions/on-screen-down)
-* **on screen up** [read more...](/functions/on-screen-up)
+* **variables** : [read more...](/blocks/variables)
+* **Boolean** : [read more...](/blocks/logic/boolean)
+* **on logo up** [read more...](/reference/input/on-gesture)
+* **on screen down** [read more...](/reference/input/on-gesture)
+* **on screen up** [read more...](/reference/input/on-gesture)
 * **show string** : [read more...](/reference/basic/show-string)
-* **game library** : [read more...](/reference/game-library)
+* **game library** : [read more...](/reference/game)
 
 ## Resources
 
 * Activity: [tutorial](/lessons/headbands/activity)
-* Activity: [quiz](/lessons/headbands/quiz)
-* Extended Activity: [challenges](/lessons/headbands/challenges)
+* Quiz: [quiz](/lessons/headbands/quiz)
 
 ## Objectives
 

docs/lessons/speed-button.md

@@ -22,10 +22,10 @@ Learn how to declare a **Boolean** variable, `var t:= true` `var f:=false` for o
 ## Documentation
 
 * **running time** : [read more...](/reference/input/running-time)
-* **global variable** : [read more...](/reference/variables/globals)
-* **Boolean** : [read more...](/reference/types/boolean)
+* **variable** : [read more...](/blocks/variables)
+* **Boolean** : [read more...](/blocks/logic/boolean)
 * **on button pressed** : [read more...](/reference/input/on-button-pressed)
-* **if** : [read more...](/reference/logic/if)
+* **if** : [read more...](/blocks/logic/if)
 * **show string** : [read more...](/reference/basic/show-string)
 
 ## Objectives

docs/lessons/stem.md

@@ -9,9 +9,9 @@ Overview of Blocks lessons for the BBC micro:bit.
 ## Science
 
 * [Night Light](/lessons/night-light), dim the LEDs with set brightness
-* [Hack your headphones](/lessons/hack-your-headphones), create music on the BBC micro:bit by hacking your headphones
-* [Banana Keyboard](/lessons/banana-keyboard), create music with fruits
-* [Telegraph](/lessons/telegraph), play the telegraph game between 2 BBC micro:bits
+* [Hack your headphones](/projects/hack-your-headphones), create music on the BBC micro:bit by hacking your headphones
+* [Banana Keyboard](/projects/banana-keyboard), create music with fruits
+* [Telegraph](/projects/telegraph), play the telegraph game between 2 BBC micro:bits
 * [Zoomer](/lessons/zoomer), measure the force with acceleration
 * [Glowing pendulum](/lessons/glowing-pendulum), construct a pendulum that glows using acceleration
 

docs/reference/images/pixel.md

@@ -21,7 +21,7 @@ To figure out the ``x``, ``y`` coordinates, see [LED screen](/device/screen).
 
 ### Returns
 
-* [Boolean](/reference/types/boolean) - `true` for on and `false` for off
+* [Boolean](/blocks/logic/boolean) - `true` for on and `false` for off
 
 ### Example
 

docs/reference/images/set-pixel.md

@@ -14,7 +14,7 @@ export function setPixel(_this: micro_bit.Image, x: number, y: number, value: bo
 
 * x - [Number](/reference/types/number); the *x coordinate* or horizontal position of a pixel in an [image](/reference/images/image)
 * x - [Number](/reference/types/number); the *y coordinate* or vertical position of a pixel in an [image](/reference/images/image)
-* value -[Boolean](/reference/types/boolean); the on/off state of a pixel; `true` for on, `false` for off
+* value -[Boolean](/blocks/logic/boolean); the on/off state of a pixel; `true` for on, `false` for off
 
 ### x, y coordinates?
 

docs/reference/input/button-is-pressed.md

@@ -12,7 +12,7 @@ input.buttonIsPressed(Button.A);
 
 ### Returns
 
-* [Boolean](/reference/types/boolean) that is `true` if the button you are checking is pressed, `false` if it is not pressed.
+* [Boolean](/blocks/logic/boolean) that is `true` if the button you are checking is pressed, `false` if it is not pressed.
 
 ### Example
 

docs/reference/input/pin-is-pressed.md

@@ -23,7 +23,7 @@ instead of the USB cable.
 
 ### returns
 
-* a [boolean](/reference/types/boolean) that means whether the pin you say is pressed (`true` or `false`)
+* a [boolean](/blocks/logic/boolean) that means whether the pin you say is pressed (`true` or `false`)
 
 ### Example
 

docs/reference/led/point.md

@@ -17,7 +17,7 @@ other than 0 to 4), this function will return `false`.
 
 ### Returns
 
-* a [boolean](/reference/types/boolean). If it is `true`, that means the LED is on. If it is `false`, that means the LED is off.
+* a [boolean](/blocks/logic/boolean). If it is `true`, that means the LED is on. If it is `false`, that means the LED is off.
 
 ### ~hint
 

docs/reference/radio/receive-number.md

@@ -23,7 +23,7 @@ radio.onDataReceived(() => {
 
 ### Example: Light level receiver 
 
-This example shows the light level from the [light level sender example](/reference/input/send-number)
+This example shows the light level from the [light level sender example](/reference/radio/send-number)
 as a number.
 
 ```blocks
@@ -36,7 +36,7 @@ basic.forever(() => {
 
 ### Example: Mailbot
 
-This example receives the light level from the [light level sender example](/reference/input/send-number)
+This example receives the light level from the [light level sender example](/reference/radio/send-number)
 and shows a text string like **ALERT** if the light level becomes much brighter.
 To find when the mail arrives, you can put the light level sender in your mailbox and it will
 tell you when someone opens the box. You can try this with a normal
@@ -58,5 +58,5 @@ basic.forever(() => {
 
 ### See also
 
-[send number](/reference/input/send-number), [on data received](/reference/radio/on-data-received)
+[send number](/reference/radio/send-number), [on data received](/reference/radio/on-data-received)
 

docs/reference/radio/received-signal-strength.md

@@ -20,7 +20,7 @@ This function only works on the micro:bit, not in browsers.
 ### Example
 
 This example shows how strong the radio signal of the
-[light level sender example](/reference/input/send-number) is.
+[light level sender example](/reference/radio/send-number) is.
 
 ```blocks
 let x = 0;

docs/reference/types/number.md

@@ -27,7 +27,7 @@ The following arithmetic operators work on numbers and return a [Number](/refere
 
 ### Relational operators
 
-The following relational operators work on numbers and return a [Boolean](/reference/types/boolean):
+The following relational operators work on numbers and return a [Boolean](/blocks/logic/boolean):
 
 * equality: `(3 + 1) = 4`
 * inequality: `3 != 4`
@@ -67,5 +67,5 @@ basic.showNumber(abs);
 
 ### See also
 
-[math](/blocks/math), [var](/blocks/variables/var), [Boolean](/reference/types/boolean), [show number](/reference/basic/show-number)
+[math](/blocks/math), [var](/blocks/variables/var), [Boolean](/blocks/logic/boolean), [show number](/reference/basic/show-number)
 

docs/reference/types/string-functions.md

@@ -0,0 +1,3 @@
+## String functions
+
+TBD