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

Conflicts:
- `.prettierignore`:
  Upstream added a line at the end of the file, while glitch-soc had its own
  extra lines.
  Took upstream's change.
- `CONTRIBUTING.md`:
  We have our custom CONTRIBUTING.md quoting upstream. Upstream made changes.
  Ported upstream changes.
- `app/controllers/application_controller.rb`:
  Upstream made code style changes in a method that is entirely replaced
  in glitch-soc.
  Ignored the change.
- `app/models/account.rb`:
  Code style changes textually close to glitch-soc-specific changes.
  Ported upstream changes.
- `lib/sanitize_ext/sanitize_config.rb`:
  Upstream code style changes.
  Ignored them.

app/javascript/packs/admin.jsx

@@ -0,0 +1,24 @@
+import './public-path';
+import ready from '../mastodon/ready';
+
+ready(() => {
+  const React    = require('react');
+  const ReactDOM = require('react-dom');
+
+  [].forEach.call(document.querySelectorAll('[data-admin-component]'), element => {
+    const componentName  = element.getAttribute('data-admin-component');
+    const { locale, ...componentProps } = JSON.parse(element.getAttribute('data-props'));
+
+    import('../mastodon/containers/admin_component').then(({ default: AdminComponent }) => {
+      return import('../mastodon/components/admin/' + componentName).then(({ default: Component }) => {
+        ReactDOM.render((
+          <AdminComponent locale={locale}>
+            <Component {...componentProps} />
+          </AdminComponent>
+        ), element);
+      });
+    }).catch(error => {
+      console.error(error);
+    });
+  });
+});