Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `CONTRIBUTING.md`:
  Upstream file has changed and we're quoting it.
  Ported the changes.
- `README.md`:
  Upstream file has changed but we have a completely different one.
  Kept our version.
- `lib/mastodon/version.rb`:
  Upstream has changed from `tootsuite/mastodon` to `mastodon/mastodon`,
  but we're still `glitch-soc/mastodon`.
  Kept our version.
- `spec/presenters/instance_presenter_spec.rb`:
  Upstream has changed from `tootsuite/mastodon` to `mastodon/mastodon`,
  but we're still `glitch-soc/mastodon`.
  Kept our version.

package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@tootsuite/mastodon",
+  "name": "@mastodon/mastodon",
   "license": "AGPL-3.0-or-later",
   "engines": {
     "node": ">=12"
@@ -18,7 +18,7 @@
   },
   "repository": {
     "type": "git",
-    "url": "https://github.com/tootsuite/mastodon.git"
+    "url": "https://github.com/mastodon/mastodon.git"
   },
   "browserslist": [
     "last 2 versions",