Update cheatsheet.fr.md

12.temporary_ins/32.sets-systems/40.n4/24.quantum-systems/20.overview/cheatsheet.fr.md

@@ -3,14 +3,6 @@ title: 'Les systèmes quantiques'
 routable: false
 visible: false
 lessons:
-    -
-        slug: systems-top-down-bottom-up-4
-        name: PARALLEL : Systems top-down or bottom-up ?
-        order: 1
-    -
-        slug: systems-bottom-up-with-differential-equations-4
-        name: MATH-TOOLS : Bottom-up and differential equations
-        order: 2
     -
         slug: classical-versus-quantum-systems-4
         name: PARALLELE : classique versus quantique systèmes