Remove publish-install-guide ocata job

This job was only used for ocata branch which is now End of Life.
Besides, the only job template that used this job is the
install-guide-jobs template, that has already been removed.

Change-Id: I8a3d0df92b265f1eb8b4f430674165a1daad6263

zuul.d/jobs.yaml

@@ -694,28 +694,6 @@
       - secret: afsdocs_secret
         name: afs
 
-- job:
-    name: publish-install-guide
-    description: |
-      Publish install-guide document to
-      https://docs.openstack.org/project-install-guide/
-    pre-run: playbooks/sphinx/pre.yaml
-    run: playbooks/sphinx/run.yaml
-    post-run: playbooks/publish/install-guide.yaml
-    roles:
-      - zuul: zuul/zuul-jobs
-      - zuul: openstack/openstack-zuul-jobs
-    # This job runs only pre-pike, with pike the documents have been
-    # integrated into normal builds.
-    branches:
-      - stable/ocata
-    vars:
-      sphinx_build_dir: install-guide/build
-      sphinx_source_dir: install-guide/source
-    secrets:
-      - secret: afsdocs_secret
-        name: afs
-
 - job:
     name: promote-deploy-guide
     parent: opendev-promote-docs-base