Show table of contents for notes

[bertptrs]

Is your feature request related to a problem? Please describe. As notes get longer and longer, it gets harder to navigate around the entire document. It would be nice to be able to quickly jump around a note.

Describe the solution you'd like The plugin could render a table of contents on the side of the document, based on the headings present in the note. Clicking on these headings would send you to the appropriate place in the note.

Describe alternatives you've considered You could add internal links in the note and manually write a ToC, but that doesn't work as of now since the headings don't have IDs.

Additional context Google Docs' implementation as shown below is a nice example of how this could work

[stefan-niedermann]

References https://github.com/stefan-niedermann/nextcloud-notes/issues/401

[korelstar]

I like this. In the context of #331, also referring to https://github.com/nextcloud/text/issues/825