* Change references to tootsuite/mastodon to mastodon/mastodon
* Remove obsolete test fixture
* Replace occurrences of tootsuite/mastodon with mastodon/mastodon in CHANGELOG
And a few other places
* Fix crowdin badge display in CONTRIBUTING.md
The Crowdin localization badge in `CONTRIBUTING.md` appeared to have the wrong markup around it. This manifested in some extra brackets and an unformatted `crowdin` string.
* Make Crowdin badge a link to the Mastodon project
* Remove docker guide and put it in docs repo
* Move tasks to docs repo
* Move requirements to contributing doc
* Move advice about tagged releases to docs repo
* Move local domain and host config to docs repo
* Link to related tech
Claire