Set up for Ussuri

* Move uncompleted specs to the backlog (will discuss adding them to
  Ussuri in planning meeting)
* Move Train section under "implemented"
* Create new empty section for Ussuri with new roadmap link

Change-Id: Id06bba1512364f8b4daeb3a594ff1e5b896f1b90

doc/source/index.rst

@@ -14,15 +14,17 @@ Project Documentation:
 keystone
 --------
 
-Train approved specs:
+Ussuri approved specs:
 
-`Train Roadmap <https://trello.com/b/ClKW9C8x/keystone-train-roadmap>`_
+`Ussuri Roadmap <https://tree.taiga.io/project/keystone-ussuri-roadmap/kanban>`_
 
-.. toctree::
-   :glob:
-   :maxdepth: 1
+.. Uncomment when spec for Ussuri is added
 
-   specs/keystone/train/*
+   .. toctree::
+      :glob:
+      :maxdepth: 1
+
+      specs/keystone/ussuri/*
 
 Backlog:
 
@@ -99,6 +101,16 @@ Implemented Identity Program Specifications
 keystone
 --------
 
+Train approved specs:
+
+`Train Roadmap <https://trello.com/b/ClKW9C8x/keystone-train-roadmap>`_
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   specs/keystone/train/*
+
 Stein approved specs:
 
 `Stein Roadmap <https://trello.com/b/rj0ECz2c/keystone-stein-roadmap>`_