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

Conflicts:
- `README.md`:
  Discarded upstream changes: we have our own README
- `app/controllers/follower_accounts_controller.rb`:
  Port upstream's minor refactoring

app/views/auth/sessions/new.html.haml

@@ -6,6 +6,8 @@
 
 - unless omniauth_only?
   = simple_form_for(resource, as: resource_name, url: session_path(resource_name)) do |f|
+    %h1.title= t('auth.sign_in.title', domain: site_hostname)
+    %p.lead= t('auth.sign_in.preamble_html', domain: site_hostname)
     .fields-group
       - if use_seamless_external_login?
         = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.username_or_email'), input_html: { 'aria-label': t('simple_form.labels.defaults.username_or_email') }, hint: false