Update cheatsheet.en.md

01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/02.new-course-overview/cheatsheet.en.md

@@ -119,6 +119,7 @@ _Converging thin lens representation : $\overline{OF}<0$ , $\overline{OF'}>0$ an
 
 ##### Converging thin lens
 
+<!--
 **Towards geogebra animations** :<br>
 \- Graphical construction<br>
 [Click here for geogebra animation](https://www.geogebra.org/material/iframe/id/zqwazusz)<br>
@@ -126,6 +127,7 @@ _Converging thin lens representation : $\overline{OF}<0$ , $\overline{OF'}>0$ an
 [Click here for geogebra animation](https://www.geogebra.org/material/iframe/id/wkrw5qgm)<br>
 \- Graphical construction and transverse magnification<br>
 [Click here for geogebra animation](https://www.geogebra.org/material/iframe/id/xwbwedft)<br>
+-->
 
 * **Point source located between &infin; et F**