Doc: Restructured readme.rst

This patch converts the readme.rst, placed outside
of the documentation directory to a quick reference
page, using direct linking for hyperlinks. Doing so
would allow cgit to render it properly

Contents of the file have been moved to the index.rst.in

Change-Id: I6769465561ccaf98957af325103bef8b89b71026
Signed-off-by: Galanakis, Minos <minos.galanakis@arm.com>
diff --git a/docs/conf.py.in b/docs/conf.py.in
index f5d9c14..bc79be7 100644
--- a/docs/conf.py.in
+++ b/docs/conf.py.in
@@ -81,7 +81,7 @@
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path .
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store', 'readme.rst']
 
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'