rearrange existing documentation to fit the new standard layout

For more detail, see the doc migration spec:
http://specs.openstack.org/openstack/docs-specs/specs/pike/os-manuals-migration.html

The current installation document is mainly for contributors not operators.
It is better to be reviit later, but it is beyond the scope of this patch.

Change-Id: Ibdbb20131b5c7bea6a1e6ab8ff47b971889ad319

.gitignore

@@ -2,7 +2,7 @@ AUTHORS
 ChangeLog
 build
 cover
-doc/source/sourcecode
+doc/source/contributor/api/
 node_modules
 npm-debug.log
 releasenotes/build

doc/source/conf.py

@@ -71,7 +71,7 @@ def write_autodoc_index():
                     modlist.append(result)
         return modlist
 
-    RSTDIR = os.path.abspath(os.path.join(BASE_DIR, "sourcecode"))
+    RSTDIR = os.path.abspath(os.path.join(BASE_DIR, "contributor/api"))
     SRCS = [('zun_ui', ROOT), ]
 
     EXCLUDED_MODULES = ()

doc/source/contributor/index.rst

@@ -0,0 +1,19 @@
+=================
+Contributor Guide
+=================
+
+There is no topic specific to Zun UI now.
+
+See `Horizon Developer Documents
+<https://docs.openstack.org/horizon/latest/contributor/index.html>`__
+for general topic on developing a dashboard on horizon.
+
+
+Source Code Reference
+---------------------
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   api/autoindex

doc/source/index.rst

@@ -8,24 +8,20 @@ Horizon plugin for Zun
 * Source: https://git.openstack.org/cgit/openstack/zun-ui
 * Bugs: https://bugs.launchpad.net/zun-ui
 
-Usage
------
+User Documentation
+------------------
 
 .. toctree::
-  :maxdepth: 1
+   :maxdepth: 2
 
-  install
+   install/index
+   Release Notes <https://docs.openstack.org/releasenotes/zun-ui>
 
-Release Notes
--------------
-
-* https://docs.openstack.org/releasenotes/zun-ui
-
-Source Code Reference
----------------------
+Contributor Guide
+-----------------
 
 .. toctree::
-  :glob:
-  :maxdepth: 1
+   :glob:
+   :maxdepth: 2
 
-  sourcecode/autoindex
+   contributor/index