⚗️(frontend) add button Restore this version near title

When a user is on a page version, we will display
a button "Restore this version" near the title of
the page. It gives an obvious way to restore the
version of the doc.

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to
 
 - ✨Add image attachments with access control
 - ✨(frontend) Upload image to a document #211
+- ✨(frontend) Versions #217
 
 ## Changed