now allows to cycle through multiple images

I haven't had a chance to test this, because I don't currently have a fully functioning computer I can set up a dev-environment on, but this *should* make it so when a user toggles a post to be private, a disclaimer appears clarifying what "private" really means.

to only those from local users; Add link to "extended information" to
getting started in the UI; Add defaults for posting privacy; Change
how publish button looks depending on posting privacy chosen

sounds complex, but really it just reorganizes the posting options and
adds a seperator line

Federate spoiler_text using warning attribute on <content /> instead of a <category term="spoiler" />
Clean up schema file from accidental development migrations

metaKey is only set correctly on keyDown, not keyUp, so this swaps to using that

Better initial state for unlisted/nsfw toggles

Fix #205, fix #156, fix #124

Fix #233, fix #268

skip ActionCable for follow/unfollow/block events, instead clear UI from
blocked account's posts instantly if block request succeeds. Add forgotten
i18n for sensitive content

See: https://dequeuniversity.com/rules/axe/2.1/label

Mostly resolves #8, though attachments are still not displayed in public view