Display Mastodon version in footer of web UI (#8013)

Fix #7846

app/javascript/mastodon/initial_state.js

@@ -12,5 +12,6 @@ export const deleteModal = getMeta('delete_modal');
 export const me = getMeta('me');
 export const searchEnabled = getMeta('search_enabled');
 export const invitesEnabled = getMeta('invites_enabled');
+export const version = getMeta('version');
 
 export default initialState;