Beta updates (#116)

* fixes for beta

- hide blocks without function
- digital Pin selection bring P0 in first position
- add compass block to end confusion about "basic.showArrow(ArrowNames.North)"
- add approved repos
- add and sort preffered repos
- add prefferedPackages
- disable webUSB
- disable parts
- remove mobileSafariDownloadProtocol
- update socialOptions

* remove `preferredPackages` from `pxtarget`

* Beta updates

- removed robobit extension
- updated docs menu
- added about.md
- added arrow icons
- removed show arrow block

Co-authored-by: Juri <gitkraken@juriwolf.de>

docs/about.md

@@ -0,0 +1,96 @@
+![](/static/mb/device/calliope_website.jpg)
+
+# About
+
+## @description A Blocks / Javascript code editor for the Calliope mini, a pocket-size computer with 5x5 display, sensors and Bluetooth.
+
+The [Calliope mini](https://calliope.cc) is a [pocket-size computer]([/device](https://calliope.cc/en/calliope-mini/tech-facts)) with a 5x5 display of 25 LEDs, Bluetooth and sensors that can be programmed by anyone.
+
+The Calliope mini provides an easy and fun introduction to programming and making ??? switch on, program it to do something fun ??? wear it, customize it.
+Just like Arduino, the Calliope mini can additionally be connected to and interact with sensors, displays, and other devices. 
+
+* [Read the docs](/docs)
+
+## [Hardware: The Device](/device)
+
+The Calliope mini is packaged with sensors, radio and other goodies. Learn about the [hardware components]([/device](https://calliope.cc/en/calliope-mini/tech-facts)) of the Calliope mini to make the most of it!
+
+## ~ hint
+
+**Looking to buy a Calliope mini?** See the [list of resellers](https://calliope.cc/en/shops).
+
+## ~
+
+## Programming: [Blocks](/blocks) or [JavaScript](/javascript)
+
+You can program the Calliope mini using [Blocks](/blocks) or [JavaScript](/javascript) in your web browser via the [Calliope mini APIs](/reference):
+
+```block
+input.onButtonPressed(Button.A, () => {
+    basic.showString("Hi!");
+})
+```
+```typescript
+input.onButtonPressed(Button.A, () => {
+    basic.showString("Hi!");
+})
+```
+
+The editor work in [most modern browsers](/browsers), work [offline](/offline) once loaded and do not require any installation. 
+
+## [Compile and Flash: Your Program!](/device/usb)
+
+When you have your code ready, you connect your Calliope mini to a computer via a USB cable, so it appears as a mounted drive (named MINI). If you are using the Calliope mini REV2 you also see another drive (FLASH) that handels up to 25 additional programs.  
+
+Compilation to ARM thumb machine code from [Blocks](/blocks) or [JavaScript](/javascript) happens in the browser. You save the ARM binary 
+program to a file, which you then copy to the micro:bit drive, which flashes the micro:bit device with the new program.
+
+## Simulator: Test Your Code
+
+You can run your code using the micro:bit simulator, all within the confines of a web browser. 
+The simulator has support for the LED screen, buttons, as well as compass, accelerometer, and digital I/O pins.
+
+```sim
+basic.forever(() => {
+  basic.showString("Hi!");
+})
+input.onButtonPressed(Button.A, () => {
+    led.stopAnimation();
+    basic.showLeds(`
+. . . . .
+. # . # .
+. . . . .
+# . . . #
+. # # # .`);
+});
+input.onButtonPressed(Button.B, () => {
+    led.stopAnimation();
+    basic.showLeds(`
+. # . # .
+# . # . #
+# . . . #
+. # . # .
+. . # . .`);
+});
+```
+
+## Learn!
+
+We have tons of [projects](/projects), [examples](/examples) and [courses](/courses) to get your started!
+
+
+## [Command Line Tools](/cli)
+
+Looking to use @homeurl@ in your favorite editor? Install the [command line tools](/cli) and get rolling!
+
+## [Extensions](/extensions)
+
+Create, edit and distribute your own blocks and JavaScript using [extensions](/extensions). Extensions are hosted on GitHub and may be written using C++, JavaScript and/or ARM thumb.
+
+## [Open Source](/open-source)
+
+The code for the Calliope mini is [open source](/open-source) on GitHub. Contributors are welcome!
+
+```package
+radio
+```