Remove unused stx docs publish job

This job is now unused, remove it.

Change-Id: I8fc1b62643c9b9b766015bcf2e57d420f2157b7f

zuul.d/starlingx-jobs.yaml

@@ -121,22 +121,6 @@
       sphinx_build_dir: api-ref/build
       tox_envlist: api-ref
 
-- job:
-    name: publish-stx-docs
-    parent: publish-stx-tox-base
-    description: |
-      Publish the results of a sphinx build to
-      /afs/.openstack.org/project/starlingx.io/www
-
-      Builds the docs using ``tox -e docs``.
-    # Set final to avoid override of afs_subpath variable.
-    final: true
-    allowed-projects:
-      - starlingx/docs
-    vars:
-      # Define empty so we publish to the webroot
-      afs_subpath: ""
-
 - job:
     name: publish-stx-election
     parent: publish-stx-tox-base