fix: navbar issues

• Navbar turns transparent when scrolling up
• The "l'équipe" and "home" sections stay highlighted

added To Do label

assigned to @Plumtree3D

changed title from fix:"qui sommes nous" highlight to fix: navbar issues

changed the description

mentioned in issue #25 (closed)

mentioned in merge request !16 (merged)

mentioned in merge request !14 (merged)

added Doing label and removed To Do label

marked the checklist item Navbar turns transparent when scrolling up as completed

marked the checklist item The "l'équipe" and "home" sections stay highlighted as completed

added Need review label and removed Doing label

mentioned in commit 87f6cbfb

closed with merge request !16 (merged)

removed Need review label