Add ability to search accounts by display name

make status pagination headers generation more lax about next page
existing

Using catch statement in api_controller.rb to catch NotPermitted
Exception, and render error message

Moved validation to services/post_status_service.rb

Modified uploadCompose action to send media ids of attached
media when sending a request. Modified create method in MediaController
to check if when posting a video, there are no other media attached
to the status by looking at the media ids sent from the uploadCompose
action.

Make replies default to privacy settings of the status being replied to

StreamEntry model. Simply render Salmon slaps as they are needed

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

redis-backed "mentions" timeline as redundant (given notifications)

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

in the background instead. Should fix delay where blocked person
can interact with blocker for a short time before background job
gets processed

background as well since it's a computationally expensive

now return empty hash instead of throwing a 404 error. When following,
merge into timeline will filter statuses

used from nginx when Rails fails.