Fix Tor access

Configure alternate_domains for Rails app to re-enable Tor access (was
throwing 403s without this config)

environments/production.json

@@ -16,6 +16,11 @@
           "use_ssl": "false"
         }
       }
+    },
+    "kosmos-mastodon": {
+      "alternate_domains": [
+        "mastodon.w7nooprauv6yrnhzh2ajpcnj3doinked2aaztlwfyt6u6pva2qdxqhid.onion"
+      ]
     }
   }
 }