Added mastodon.network.

Unless something changed recently I have no clue why this said that direct posts do not federate because they do.

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.

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

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.

It's hard to tell if this is supposed to be alphabetically sorted or not. I put it after epiktistes since it starts with F - let me know if it should go elsewhere.

Updated list with lots of instances that have been added to instances.mastodon.xyz but not this list

Closes GH-745.