Change design of account notes in web UI (#14208)

app/javascript/mastodon/actions/account_notes.js

...ript/mastodon/features/account/components/account_note.js

...javascript/mastodon/features/account/components/header.js

...don/features/account/containers/account_note_container.js

.../features/account_timeline/containers/header_container.js

app/javascript/mastodon/locales/defaultMessages.json

app/javascript/mastodon/locales/en.json

app/javascript/mastodon/reducers/account_notes.js

app/javascript/mastodon/reducers/index.js

app/javascript/styles/mastodon/components.scss

app/serializers/rest/relationship_serializer.rb