[Vue Rewrite] Single Feed Route using FeedItemDisplayList component

[devlinjunker]

Related to #748

Follows #2333

🗒️ Summary

Added another new route and component for displaying all items in a single feed, reusing the FeedItemDisplayList component

• Feed Id is displayed in the URL bar and can be loaded from there
• Title Unread count is shown at the top of the page
• Seems there is a bug I need to work out with fetching all items, and determining when to stop fetching (i.e "reached the end" of the scroll list)
• Moved all route based components to subdirectory routes

Added Filters to FeedItemDisplayList component

• For filtering starred/unread items in a list of items
• Added config to FeedItemDisplayList to disable these (e.g. disable star filter on starred route, and unread filter on unread route)

✅ Checklist

• Code is properly formatted
• Sign-off message is added to all commits
  - [ ] Changelog entry added for all important changes. (Can we add the skip-changelog label to prevent the check for changelog? )

📷 Visual

single feed route:

loading feed based on url param:

filter:

➡️ Up Next

• Fix bug in fetching items
• Create feed-display/ directory and move all Feed... components into it (also create internal/ subdir that holds VirtualScroll and ItemSkeleton)
• Reuse VirtualScroll component for:
  • display items in a folder
  • display all items in database
• (WIP) Move API Requests to Service Classes (to be shared between stores and prevent stuff like having to duplicate api requests like here…)
• Sidebar Actions (WIP)
• use ?selected=<id> url query parameter to store and parse which Feed Item is displayed in FeedItemDisplay
• Quick access to Settings
• Update Documentation
• Mobile friendly layout