Linking pages improvements (meta issue)

[mejo-]

This meta issue is here to track possible link handling improvements

• [ ] Linking a page should be the first and most obvious way of linking in Collectives. One solution would be a new toplevel entry "Link to page" in the link section of the Text menubar. This entry could open the "Collectives pages" picker in the smart picker. #979
• [ ] The "Collectives pages" picker in the smart picker could provide a page picker (similar to the move/copy modal) additionally to just listing search results.
• [x] When adding a link via smart picker, we should add a markdown link with the page title as title (like [page title](/link/to/page.md?fileId=123)) instead of just pasting the URL. #949
• [x] When clicking a link in edit mode, it should open a popover that allows navigating to the link and/or editing the link. #845
• [x] Link previews could show only on hover/click instead of being displayed all the time. We got quite a few complaints about link previews cluttering the page. Also related to #845

[timkrief]

Here's a suggestion: https://github.com/nextcloud/collectives/issues/1073