[FR] View relations of Pages

### Description

It's now possible to insert inline links to other pages, it would be nice if we could also on a page, view which pages link to this specific page, and by clicking on them, go to the page and location of the link.

### Impact

Useful for note-takers who insert references to other notes and want to get a quick overview of where a certain page is linked to see the relations.

### Additional Context

_No response_

No files, tests, or entry points are named in the issue. Start by locating the page and inline-link models and the navigation used when opening a link; done means a page lists incoming links and each item opens the source page at the link location.

Written by the indexing model from the issue text.