refreshes on navigation

admin UI

Descriptions of differences between scope are more clear

add ability to open status by URL from search (fix #53)

"Various apps are available" is now a hyperlink

adjusted to allow choosing it, yet

before. In the API, attachments now can be either image, video or gifv. Gifv
is to be treated like images in terms of behaviour, but are videos by file
type.

Remove note about following Gargron@mastodon.social from getting started text

loaded status; do not preload submitted statuses into community/public
timelines, unless those timelines have already been loaded; do not
close streaming API connections for community/public timelines, once
they have been established (most users navigate back to them eventually)

for those errors

now allows to cycle through multiple images