Add a missing doctree xena, yoga release in install guide

The xena and yoga release's install guide are missing in a doc.
I added the following items in install guilde.
- Add a yoga ubuntu repository in Archive Eablement.
- Add an openstack service install guide for xena, yoga

Change-Id: Idaf28719faed357d21c09eb7e11d520bebce2c05
Co-authored-by: hongjungyeon <wjddus9864@jj.ac.kr>

doc/install-guide/source/environment-packages-ubuntu.rst

@@ -14,6 +14,11 @@ Archive.
 
 Archive Enablement
 ------------------
+**OpenStack Yoga for Ubuntu 20.04 LTS:**
+
+.. code-block:: console
+
+   # add-apt-repository cloud-archive:yoga
 
 **OpenStack Xena for Ubuntu 20.04 LTS:**
 

doc/install-guide/source/openstack-services.rst

@@ -6,6 +6,10 @@ The installation of individual OpenStack services is covered in the
 Project Installation Guides that are available at the following
 locations:
 
+* `OpenStack Installation Guides for Yoga
+  <https://docs.openstack.org/yoga/install/>`_
+* `OpenStack Installation Guides for Xena
+  <https://docs.openstack.org/xena/install/>`_
 * `OpenStack Installation Guides for Wallaby
   <https://docs.openstack.org/wallaby/install/>`_
 * `OpenStack Installation Guides for Victoria
@@ -23,6 +27,52 @@ locations:
 * `OpenStack Installation Guides for Pike
   <https://docs.openstack.org/pike/install/>`_
 
+Minimal deployment for Yoga
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+At a minimum, you need to install the following services. Install the services
+in the order specified below:
+
+* Identity service – `keystone installation for Yoga
+  <https://docs.openstack.org/keystone/yoga/install/>`_
+* Image service – `glance installation for Yoga
+  <https://docs.openstack.org/glance/yoga/install/>`_
+* Placement service – `placement installation for Yoga
+  <https://docs.openstack.org/placement/yoga/install/>`_
+* Compute service – `nova installation for Yoga
+  <https://docs.openstack.org/nova/yoga/install/>`_
+* Networking service – `neutron installation for Yoga
+  <https://docs.openstack.org/neutron/yoga/install/>`_
+
+We advise to also install the following components after you have installed the
+minimal deployment services:
+
+* Dashboard – `horizon installation for Yoga <https://docs.openstack.org/horizon/yoga/install/>`_
+* Block Storage service – `cinder installation for Yoga <https://docs.openstack.org/cinder/yoga/install/>`_
+
+Minimal deployment for Xena
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+At a minimum, you need to install the following services. Install the services
+in the order specified below:
+
+* Identity service – `keystone installation for Xena
+  <https://docs.openstack.org/keystone/xena/install/>`_
+* Image service – `glance installation for Xena
+  <https://docs.openstack.org/glance/xena/install/>`_
+* Placement service – `placement installation for Xena
+  <https://docs.openstack.org/placement/xena/install/>`_
+* Compute service – `nova installation for Xena
+  <https://docs.openstack.org/nova/xena/install/>`_
+* Networking service – `neutron installation for Xena
+  <https://docs.openstack.org/neutron/xena/install/>`_
+
+We advise to also install the following components after you have installed the
+minimal deployment services:
+
+* Dashboard – `horizon installation for Xena <https://docs.openstack.org/horizon/xena/install/>`_
+* Block Storage service – `cinder installation for Xena <https://docs.openstack.org/cinder/xena/install/>`_
+
 Minimal deployment for Wallaby
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

doc/install-guide/source/overview.rst

@@ -32,7 +32,8 @@ following steps toward deployment using a production architecture:
   to automate deployment and management of the production environment.
   The OpenStack project has a couple of deployment projects with
   specific guides per version:
-
+  - `Yoga release <https://docs.openstack.org/yoga/deploy/>`_
+  - `Xena release <https://docs.openstack.org/xena/deploy/>`_
   - `Wallaby release <https://docs.openstack.org/wallaby/deploy/>`_
   - `Victoria release <https://docs.openstack.org/victoria/deploy/>`_
   - `Ussuri release <https://docs.openstack.org/ussuri/deploy/>`_