Revert "falcon: Add GitLab Runner with /nest"

This would basically only be needed for Nest builds and deploys, both of
which can be accomplished with `-v /nest:/nest` in the docker-tagged
runner.

This reverts commit 1534c477.

manifests/node/falcon.pp

@@ -257,10 +257,5 @@ class nest::node::falcon {
       docker_volumes => ['/var/run/docker.sock:/var/run/docker.sock'],
       tag_list       => ['docker'],
     ;
-
-    'gitlab.james.tl-nest':
-      docker_volumes => ['/nest:/nest'],
-      tag_list       => ['nest'],
-    ;
   }
 }