remove linksto lessons from references

docs/reference/loops/for.md

@@ -14,10 +14,6 @@ basic.showNumber(i)
 }
 ```
 
-### Lessons
-
-[looper](/lessons/looper)
-
 ### See also
 
 [repeat](/reference/loops/repeat), [while](/reference/loops/while), [if](/reference/logic/if), [show number](/reference/basic/show-number)

docs/reference/loops/repeat.md

@@ -6,10 +6,6 @@ Run part of the program the number of times you say.
 
 ![](/static/mb/blocks/contents-0.png)
 
-### Lessons
-
-[looper](/lessons/looper)
-
 ### See also
 
 [for](/reference/loops/for), [while](/reference/loops/while), [if](/reference/logic/if), [show number](/reference/basic/show-number)

docs/reference/loops/while.md

@@ -26,10 +26,6 @@ while(index >= 0) {
 }
 ```
 
-### Lessons
-
-[rotation animation](/lessons/rotation-animation)
-
 ### See also
 
 [on button pressed](/reference/input/on-button-pressed), [for](/reference/loops/for), [if](/reference/logic/if), [forever](/reference/basic/forever)