show the README on the homepage

instead of a boring table of contents, try to show our more exciting README file

it's still a wall of text, but at least all the buzzwords and highlights are there

ideally, the table of contents would be in the sidebar, but i don't know how to do that

docs/index.rst

@@ -4,10 +4,11 @@
 Borg Documentation
 ==================
 
+.. include:: ../README.rst
+
 .. toctree::
    :maxdepth: 2
 
-   intro
    installation
    quickstart
    usage

docs/intro.rst

@@ -1,7 +0,0 @@
-.. include:: global.rst.inc
-.. _foreword:
-
-Introduction
-============
-
-.. include:: ../README.rst