Add Onion-Location header for kosmos.social

Tells Tor Browser where to find the native onion site.

refs #201

site-cookbooks/kosmos-mastodon/templates/default/nginx_conf_mastodon.erb

@@ -22,6 +22,7 @@ server {
   ssl_certificate_key <%= @ssl_key %>;
 
   add_header Strict-Transport-Security "max-age=31536000";
+  add_header Onion-Location https://mastodon.<%= @onion_address %>$request_uri;
 }
 <% end %>