♻️(frontent) improve summary feature

- Change Summary to Table of content
- No dash before the title
- Change font-size depend the type of heading
- If more than 2 headings the panel is open
by default
- improve sticky
- highligth the title where you are in the page

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to
 - ♻️ Allow null titles on documents for easier creation #234
 - 🛂(backend) stop to list public doc to everyone #234
 - 🚚(frontend) change visibility in share modal #235
+- ⚡️(frontend) Improve summary #244
 
 ## Fixed