Move Developer guides to separate directory

Also move scale_deployment.rst guide to operating_guides directory.

Change-Id: I5ef057f0e94eb40808cc212fffa8f673ecf40694

doc/source/developing_guides/index.rst

@@ -0,0 +1,25 @@
+..
+      Licensed under the Apache License, Version 2.0 (the "License"); you may
+      not use this file except in compliance with the License. You may obtain
+      a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+      WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+      License for the specific language governing permissions and limitations
+      under the License.
+
+Developing Guides
+=================
+
+.. toctree::
+   :maxdepth: 1
+
+   on_devstack
+   on_fedora
+   on_ubuntu
+   on_other
+   jeos_building
+   standalone

doc/source/index.rst

@@ -62,7 +62,7 @@ Operating Heat
 
     getting_started/on_fedora
     getting_started/on_ubuntu
-    scale_deployment
+    operating_guides/scale_deployment
     man/index
 
 Developing Heat
@@ -71,11 +71,11 @@ Developing Heat
     :maxdepth: 1
 
     getting_started/on_devstack
-    architecture
-    pluginguide
-    schedulerhints
-    gmr
-    supportstatus
+    developing_guides/architecture
+    developing_guides/pluginguide
+    developing_guides/schedulerhints
+    developing_guides/gmr
+    developing_guides/supportstatus
 
 API Documentation
 ========================