Implement new create and manager trigger UI

Implements the new trigger setup user interface, which is now a linear workflow found on its own page, rather than a tiny modal dialog

Fixes #1187

endpoints/githubtrigger.py

@@ -34,8 +34,7 @@ def attach_github_build_trigger(namespace_name, repo_name):
 
     trigger = model.build.create_build_trigger(repo, 'github', token, current_user.db_user())
     repo_path = '%s/%s' % (namespace_name, repo_name)
-    full_url = '%s%s%s' % (url_for('web.repository', path=repo_path), '?tab=builds&newtrigger=',
-                           trigger.uuid)
+    full_url = url_for('web.buildtrigger', path=repo_path, trigger=trigger.uuid)
 
     logger.debug('Redirecting to full url: %s', full_url)
     return redirect(full_url)