site_title is "Mastodon" by default configuration, and there is no need to default site_title with site_hostname in InstanceHelper.
* Move site title helper to instance helper (name change only) * Remove newline in <title> tag * Add site_hostname helper method to wrap up local_domain value * Use site_hostname helper in places that need local_domain value
Akihiko Odaki
Yamagishi Kazutoshi
Matt Jankowski