Add relnotes publish job

* Add pointers in the main doc to releasenotes pages
* Add publish-stx-releasenotes job
* Add search at bottom of relnotes page to trigger the job

Change-Id: I2102776bf3ec4e7ef0603fe389bf97889be45632
Signed-off-by: Dean Troyer <dtroyer@gmail.com>

.zuul.yaml

@@ -13,3 +13,4 @@
     post:
       jobs:
         - publish-stx-tox
+        - publish-stx-releasenotes

doc/source/index.rst

@@ -7,6 +7,14 @@ StarlingX Build Tools
    :maxdepth: 2
    :caption: Contents:
 
+Release Notes
+-------------
+
+.. toctree::
+   :maxdepth: 1
+
+   Release Notes <https://docs.starlingx.io/releasenotes/stx-tools>
+
 Links
 =====
 

releasenotes/source/index.rst

@@ -1,3 +1,4 @@
+=======================
 stx-tools Release Notes
 =======================
 
@@ -5,3 +6,9 @@ stx-tools Release Notes
    :maxdepth: 2
 
    unreleased
+
+Search
+------
+
+:ref:`search`
+