fix seo on main documentation page

Author: Gabriel Monroy

docs/index.rst

@@ -1,6 +1,6 @@
-:title: Welcome to the Deis documentation
-:description: An overview of the Deis documentation
-:keywords: api, commandline, command-line, contributing, faq, terms, tutorial, deis, docker, heroku
+:title: Deis Documentation | Your PaaS. Your Rules.
+:description: Welcome to the Deis documentation homepage
+:keywords: api, commandline, command-line, contributing, faq, terms, tutorial, deis, docker
 
 Welcome
 =======
@@ -21,4 +21,4 @@ in the :ref:`client` and :ref:`server` sections.
 
 Interested in contributing to the Deis project?  Check out our
 :ref:`Contributor Overview <contributor>` and 
-:ref:`devsetup` instructions.
+:ref:`devsetup` instructions.