Fix deploy-guide links

Deploy guides includes quickstart guide.
Includes respect relative paths, but when
quickstart includes vagrant doc, deploy-guide
tries to locate the doc in its doctree (deploy-guide/source).

This causes error 404 and deploy-guide post-gates to fail

Change-Id: I05e49bbcef564ad4f3d80f0649ccf191d9f8b59d

deploy-guide/source/multinode.rst

 .. multinode:
-.. include:: ../../doc/multinode.rst
+.. include:: ../../doc/source/user/multinode.rst

deploy-guide/source/quickstart.rst

 .. quickstart:
-.. include:: ../../doc/quickstart.rst
+
+.. include:: ../../doc/source/user/quickstart.rst

doc/source/contributor/CONTRIBUTING.rst

@@ -30,8 +30,8 @@ Basics
 Development Environment
 =======================
 
-Please follow our :doc:`/user/quickstart` to deploy your environment and test your
-changes.
+Please follow our :doc:`/user/quickstart` to deploy your environment and test
+your changes.
 
 Please use the existing sandbox repository, available at
 https://git.openstack.org/cgit/openstack-dev/sandbox, for learning, understanding

doc/source/user/quickstart.rst

@@ -29,7 +29,7 @@ bare metal or a virtual machine with Kolla.
 
 If developing Kolla on a system that provides VirtualBox or Libvirt in addition
 to Vagrant, use the Vagrant virtual environment documented in
-:doc:`/contributor/vagrant-dev-env`.
+`Development Environment with Vagrant <https://docs.openstack.org/kolla-ansible/latest/contributor/vagrant-dev-env.html>`_.
 
 Prerequisites
 =============