Update textbook.fr.md

00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/textbook.fr.md

@@ -1,17 +1,7 @@
 ---
-title: Mécanique classique, n2, main
+title: classical mechanics-n1-fr
 published: true
 routable: true
 visible: false
-lessons:
-    - slug: mecanique-classique-n2-linear
-      order: 1
-    - slug: mecanique-classique-123-panorama
-      order: 2
-    - slug: mecanique-classique-234-panorama
-      order: 2
-    - slug: classical-mechanics-n2-exchange
-      order: 2
 ---
 
-### Mécanique classique, n2, main