feat: configure lesson `/lesson/geometrical-optics-domain-of-validity`

01.curriculum/01.physics-chemistry-biology/03.Niv3/02.geometrical-optics/01.geometrical-optics-general/02.geometrical-optics-validity/01.geometrical-optics-domain-of-validity-main/textbook.en.md

@@ -1,7 +1,9 @@
 ---
 title: 'Validity domain of geometric optics'
-published : false
-visible : false
+published: false
+visible: false
+lessons:
+    - slug: geometrical-optics-domain-of-validity
 ---
 
 ###Domaine de validité de l'optique géométrique

01.curriculum/01.physics-chemistry-biology/03.Niv3/02.geometrical-optics/01.geometrical-optics-general/02.geometrical-optics-validity/02.geometrical-optics-domain-of-validity-overview/cheatsheet.en.md

@@ -1,8 +1,10 @@
 ---
-title: 'The optics for everyday life'
+title: "The optics for everyday life"
 media_order: 'chrono_text_opt_geo_fr_v2.jpeg,sciences_optique_rays_fr.jpeg,chrono_opt_geo_fr_v2.jpeg,Opt_geom_1.jpg,OG_intro.mp3,OG_intro.ogg'
-published : true
-visible : false
+published: true
+visible: false
+lessons:
+    - slug: geometrical-optics-domain-of-validity
 ---
 
 ### The optics for everyday life

01.curriculum/01.physics-chemistry-biology/03.Niv3/02.geometrical-optics/01.geometrical-optics-general/02.geometrical-optics-validity/03.geometrical-optics-domain-of-validity-beyond/annex.en.md

@@ -1,5 +1,7 @@
 ---
 title: 'new course : beyond'
+lessons:
+    - slug: geometrical-optics-domain-of-validity
 ---
 
 ! *YOUR  CHALLENGE*  :  look at the picture, and think of the right answers to the following questions