Quick attempt to get pull requests passing

s/rails/rake/

If the file package is not installed, we get "Validation failed: File has contents that are not what they are reported to be" when upload media.

[SKIP CI]

Missing -u parameter to specify the mastodon user.

This adds the ability to filter user signup with a whitelist
instead of or in addition to a blacklist.

Fixes #817

As far as I'm aware, my instance should be supporting IPv6 now. Was an error on my part that it wasn't working before.

Add my own instance

Accessibility Fix.

Add octodon.social

Add fern.surgeplay.com to the instances list

update social.targaryen.house info

Fix typo in ISSUE_TEMPLATE

Add instances from instances.mastodon.xyz

Fix typo in Heroku guide

More consistent typography

Create ISSUE_TEMPLATE.md to bring down duplicate issues

make regeneration worker unique, (only schedule/execute once at a time)

do not re-create a dynamic class on each feed push call, make sure redis-rb uses hiredis

must be added to the Sidekiq invokation in your systemd file

The pull queue will handle link crawling, thread resolving, and OStatus
processing. Such tasks are more likely to hang for a longer time (due to
network requests) so it is more sensible to not make the "in-house" tasks
wait for them.