Added a HOWTO page release based source edits.

conf.py
-------
   * Exclude all variants of python virtual env from traversal.
   * Exclude __pycache__ from document traversal.

index.rst
---------
   * Create a top level index link/page for release howto(s).

overview/contributing.rst
-------------------------
   * Document version based script edits required at time of release.
   * This URL will be used by repo:ci-management/vars/installVoltctl
     to display self-documenting help.

*/urls
------
   * Added placeholders and resources for documenting future topics.

Chaser edits:
-------------
   o Bump VERSION string.
   o 'stern' URL in unrelated troublteshooting.rst doc failed link check:
      + github repo no longer exists.
      + add replacement github/stern/stern

Change-Id: I2f0f15eb5ba7bd6817806296928964df5259b21a
diff --git a/overview/troubleshooting.rst b/overview/troubleshooting.rst
index 4dc03cb..1bd2fc9 100644
--- a/overview/troubleshooting.rst
+++ b/overview/troubleshooting.rst
@@ -17,8 +17,8 @@
 -------------------------------
 
 Given that ``VOLTHA`` is a collection of microservices we strongly suggest the usage of a log aggregator like
-`stern <https://github.com/wercker/stern>`_. installed. You can then aggregate logs from multiple containers in a simple way,
-for example to track all the ``packet-ins`` and ``packet-outs``:
+`stern <https://github.com/stern/stern>`_ installed. You can then aggregate logs from multiple containers in
+a simple way, for example to track all the ``packet-ins`` and ``packet-outs``:
 
 .. code:: bash