PostMarked (unread, read, important, etc.)

[allo-]

Add a Post<->User relationship with an intermediate model, which marks a post as

• read
• unread
• important
• favourite
• read it later
• (...)

[allo-]

Implemented in https://github.com/allo-/feedjack/commit/23690410fd27d2e686f1432cc7a03c3212a74c8a

TODO:

• [x] Add filtering by marker.
• [ ] mark all function (for migration and/or new users)
• [ ] maybe mark automatically when scrolling the article out of view?
• [ ] working without JS (redirect to the same page, anchor at the marked article, if it's not filtered after the click or anchor of the next one)
• [ ] hide posts on filters views after marking, using JS. Provide an undo button.
  • Example: reading marked=U(unread), marking as read should hide the post, leaving a line "click here to mark as unread again", which restores the article into view and marks it as unread again.
  • Possible the article list should be updated loading a new article at the bottom after the article is removed. Updating the page/post counters is a also a good idea.