feat: review the lessons order

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

@@ -4,6 +4,7 @@ published: false
 visible: false
 lessons:
     - slug: geometrical-optics-domain-of-validity
+      order: 1
 ---
 
 ### 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

@@ -5,6 +5,7 @@ published: true
 visible: false
 lessons:
     - slug: geometrical-optics-domain-of-validity
+      order: 2
 ---
 
 ### 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

@@ -2,6 +2,7 @@
 title: 'new course : beyond'
 lessons:
     - slug: geometrical-optics-domain-of-validity
+      order: 3
 ---
 
 ! *YOUR  CHALLENGE*  :  look at the picture, and think of the right answers to the following questions