Update docs and README with new locations

Set the correct Wiki URL to use for the project, we have moved over
to using the Github wiki on the main repo and not the wiki on the
website repo.

Remove references to Pivotal Greenplum documentation in the README
and stick to greenplum.orc/docs/ there as those are the applicable
docs.  While there update the README.md to actually match reality,
the docs are now in the main repo.

README.md

@@ -32,11 +32,6 @@ to the segments, and collects the results.
 
 ## Requirements
 
-* From the GPDB doc set, review [Configuring Your Systems and
-  Installing
-  Greenplum](http://gpdb.docs.pivotal.io/4360/prep_os-overview.html#topic1)
-  and perform appropriate updates to your system for GPDB use.
-
 * **gpMgmt** utilities - command line tools for managing the cluster.
 
   You will need to add the following Python modules (2.7 & 2.6 are
@@ -73,13 +68,18 @@ throughout the codebase, but a few larger additions worth noting:
 * __doc/__
 
   In PostgreSQL, the user manual lives here. In Greenplum, the user
-  manual is distributed separately (see http://gpdb.docs.pivotal.io),
-  and only the reference pages used to build man pages are here.
+  manual is maintained separately and only the reference pages used
+  to build man pages are here.
+
+* __gpdb-doc/__
+
+  Constains the Greenplum documentation in DITA XML format. Refer to
+  `gpdb-doc/README.md` for information on how to build, and work with
+  the documentation.
 
 * __ci/__
 
   Contains configuration files for the GPDB continuous integration system.
- 
 
 * __src/backend/cdb/__
 
@@ -443,6 +443,6 @@ just commit to the repository directly.
 ## Documentation
 
 For Greenplum Database documentation, please check online docs:
-http://gpdb.docs.pivotal.io
+http://greenplum.org/docs/
 
 There is also a Vagrant-based quickstart guide for developers in `src/tools/vagrant/README.md`.

gpdb-doc/book/config.yml

@@ -16,7 +16,7 @@ template_variables:
   product_link: <div class="header-item"><a href="http://greenplum.org">Back to Greenplum Database</a></div>
   product_url: http://greenplum.org
   support_call_to_action: <a href="http://greenplum.org#contribute" target="_blank">Need Support?</a>
-  support_link: <a href="https://github.com/greenplum-db/greenplum-db.github.io/wiki">Wiki</a>
+  support_link: <a href="https://github.com/greenplum-db/gpdb/wiki">Wiki</a>
   support_url: http://greenplum.org
 
 broken_link_exclusions: iefix|arrowhead