Change sign-in banner to reflect disabled or moved account status (#19773)

app/helpers/application_helper.rb

app/javascript/mastodon/containers/mastodon.js

...astodon/features/ui/components/disabled_account_banner.js

...cript/mastodon/features/ui/components/navigation_panel.js

app/javascript/mastodon/initial_state.js

app/javascript/styles/mastodon/components.scss

app/presenters/initial_state_presenter.rb

app/serializers/initial_state_serializer.rb