Remove superfluous SCSS imports file (mastodon#38261)

Author: diondiondion

app/javascript/styles/application.scss

@@ -1 +1,24 @@
-@use 'common';
+@use 'mastodon/variables';
+@use 'mastodon/mixins';
+@use 'fonts/roboto';
+@use 'fonts/roboto-mono';
+
+@use 'mastodon/reset';
+@use 'mastodon/theme';
+@use 'mastodon/basics';
+@use 'mastodon/branding';
+@use 'mastodon/containers';
+@use 'mastodon/lists';
+@use 'mastodon/widgets';
+@use 'mastodon/forms';
+@use 'mastodon/accounts';
+@use 'mastodon/components';
+@use 'mastodon/polls';
+@use 'mastodon/modal';
+@use 'mastodon/emoji_picker';
+@use 'mastodon/about';
+@use 'mastodon/tables';
+@use 'mastodon/admin';
+@use 'mastodon/dashboard';
+@use 'mastodon/rtl';
+@use 'mastodon/rich_text';