Split 1.x and 2.x Specs to separate directories

Change-Id: I25d4778b79a2bd55f6f14d8bfeed81232898e33d

doc/source/index.rst

@@ -17,20 +17,44 @@ About Specs
 
    specs/*
 
+Airship 2.x
+-----------
+
 Approved Specs
---------------
+~~~~~~~~~~~~~~
 
 .. toctree::
    :maxdepth: 1
    :glob:
 
-   specs/approved/*
+   specs/2.x/approved/*
 
 Implemented Specs
------------------
+~~~~~~~~~~~~~~~~~
 
 .. toctree::
    :maxdepth: 1
    :glob:
 
-   specs/implemented/*
+   specs/2.x/implemented/*
+
+Airship 1.x
+-----------
+
+Approved Specs
+~~~~~~~~~~~~~~
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   specs/1.x/approved/*
+
+Implemented Specs
+~~~~~~~~~~~~~~~~~
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   specs/1.x/implemented/*

specs/2.x/approved/index.rst

@@ -0,0 +1,18 @@
+..
+  This work is licensed under a Creative Commons Attribution 3.0 Unported
+  License.
+
+  http://creativecommons.org/licenses/by/3.0/legalcode
+
+.. index::
+   single: Airship
+   single: Shipyard
+   single: GUI
+   single: CLI
+   single: API
+
+===========
+Placeholder
+===========
+
+Please, remove me once any new spec is added into this directory.

specs/2.x/implemented/index.rst

@@ -0,0 +1,18 @@
+..
+  This work is licensed under a Creative Commons Attribution 3.0 Unported
+  License.
+
+  http://creativecommons.org/licenses/by/3.0/legalcode
+
+.. index::
+   single: Airship
+   single: Shipyard
+   single: GUI
+   single: CLI
+   single: API
+
+===========
+Placeholder
+===========
+
+Please, remove me once any new spec is added into this directory.

specs/instructions.rst

@@ -18,8 +18,9 @@ Instructions
 - Attempt to detail each applicable section.
 - If a section does not apply, use N/A, and optionally provide
   a short explanation.
-- New specs for review should be placed in the ``approved`` subfolder, where
-  they will undergo review and approval in Gerrit_.
+- New specs for review should be placed in the ``approved`` subfolder of
+  ``1.x`` or ``2.x`` directories (depending on Airship version they primarily
+  belong to), where they will undergo review and approval in Gerrit_.
 - Test if the spec file renders correctly in a web-browser by running
   ``make docs`` command and opening ``doc/build/html/index.html`` in a
   web-browser. Ubuntu needs the following packages to be installed::
@@ -27,7 +28,7 @@ Instructions
     apt-get install -y make tox gcc python3-dev
 
 - Specs that have finished implementation should be moved to the
-  ``implemented`` subfolder.
+  ``implemented`` subfolder of respective ``1.x`` or ``2.x`` directories.
 
 Indexing and Categorization
 ---------------------------