* Explain that markdown is enabled on the user settings page.
The current wording seems to imply that the input formatting can be
set on a per-post basis, which no client currently supports. It's not
clear that you have to go to the user settings page to change it.
* Update FAQ; some of the missing features are not missing any more!
* start adding rss functionality
* add gorilla/feeds dependency
* first bash at building rss feed
still needs work, this is an interim commit
* tidy up a bit
* add publicOnly option to GetAccountLastPosted
* implement rss endpoint
* fix test
* add initial user docs for rss
* update rss logo
* docs update
* add rssFeed to frontend
* feed -> feed.rss
* enableRSS
* increase rss logo size a lil bit
* add rss toggle
* move emojify to text package
* fiddle with rss feed formatting
* add Text field to test statuses
* move status to rss item to typeconverter
* update bun schema for enablerss
* simplify 304 checking
* assume account not rss
* update tests
* update swagger docs
* allow more characters in title, trim nicer
* update last posted to be more consistent
* add custom css account property + db func to fetch
* allow account to get/set custom css
* serve custom css for an account
* go fmt
* use monospace for customcss, add link
* add custom css to account cache
* fix broken field
* add custom css docs to user guide
* add `accounts-allow-custom-css` config flag
* add allow custom css to /api/v1/instance response
* only show/set custom css if allowed to do so
* only set/serve custom account css if enabled
* update swagger docs
* chain promise
* make bool a bit clearer
* use cache for GetAccountCustomCSSByUsername
