Add api-ref and relnotes publish jobs

* Add pointers in the main doc to api-ref and releasenotes pages
* Add publish-stx-api-ref and publish-stx-releasenotes jobs
* Add search at bottom of api-ref and relnotes pages to trigger the jobs

Depends-On: https://review.openstack.org/#/c/608409/

Change-Id: Ide9a7d5829b41191c9127af75c4320f94d82f428
Signed-off-by: Abraham Arce <abraham.arce.moreno@intel.com>

.zuul.yaml

@@ -14,4 +14,6 @@
         - openstack-tox-linters
     post:
       jobs:
+        - publish-stx-api-ref
         - publish-stx-tox
+        - publish-stx-releasenotes

api-ref/source/index.rst

@@ -8,3 +8,5 @@ StarlingX Distributed Cloud
    :maxdepth: 2
 
    api-ref-dcmanager-v1
+
+:ref:`search`

doc/source/index.rst

@@ -7,6 +7,22 @@ StarlingX Distributed Cloud
    :maxdepth: 2
    :caption: Contents:
 
+Release Notes
+-------------
+
+.. toctree::
+   :maxdepth: 1
+
+   Release Notes <https://docs.starlingx.io/releasenotes/stx-distcloud>
+
+API Reference
+-------------
+
+.. toctree::
+   :maxdepth: 1
+
+   API Reference <https://docs.starlingx.io/api-ref/stx-distcloud>
+
 Links
 =====
 

releasenotes/source/index.rst

@@ -5,3 +5,5 @@ stx-distcloud Release Notes
    :maxdepth: 2
 
    unreleased
+
+:ref:`search`