Functionality for adding an env

- uses two route functions - one for update app, another for add
environment
- uses a second form for the app settings page
- uses the /environments/new url naming convention

templates/fragments/applications/edit_environments.html

@@ -128,9 +128,6 @@
 </div>
 <div class="panel__footer">
   <div class="action-group">
-    <a class='icon-link'>
-      {{ "portfolios.applications.add_environment" | translate }}
-      {{ Icon('plus') }}
-    </a>
+
   </div>
 </div>