[docs] Convert docs index page into Sphinx.

 - Work in progress, this is mostly important because it lets us incrementally migrate the remaining documentation.
 - Lots of styling, editing, and integration work yet to come…
 - PR12589

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155133 91177308-0d34-0410-b5e6-96231b3b80d8

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+.. _contents:
+
+Overview
+========
+
+.. warning::
+
+   If you are using a released version of LLVM, see `the download page
+   <http://llvm.org/releases/>`_ to find your documentation.
+
+The LLVM compiler infrastructure supports a wide range of projects, from
+industrial strength compilers to specialized JIT applications to small
+research projects.
+
+Similarly, documentation is broken down into several high-level groupings
+targetted at different audiences:
+
+  * **Design & Overview**
+
+    Several introductory papers and presentations are available at
+    :ref:`design_and_overview`.
+
+  * **Publications**
+
+    The list of `publications <http://llvm.org/pubs>`_ based on LLVM.
+
+  * **User Guides**
+
+    Those new to the LLVM system should first vist the :ref:`userguides`.
+
+    NOTE: If you are a user who is only interested in using LLVM-based
+    compilers, you should look into `Clang <http://clang.llvm.org>`_ or
+    `DragonEgg <http://dragonegg.llvm.org>`_ instead. The documentation here is
+    intended for users who have a need to work with the intermediate LLVM
+    representation.
+
+  * **API Clients**
+
+    Developers of applications which use LLVM as a library should visit the
+    :ref:`programming`.
+
+  * **Subsystems**
+
+    API clients and LLVM developers may be interested in the
+    :ref:`subsystems` documentation.
+
+  * **Development Process**
+
+    Additional documentation on the LLVM project can be found at
+    :ref:`development_process`.
+
+  * **Mailing Lists**
+
+    For more information, consider consulting the LLVM :ref:`mailing_lists`.
+
+.. toctree::
+   :maxdepth: 2
+
+   design_and_overview
+   userguides
+   programming
+   subsystems
+   development_process
+   mailing_lists
+   
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`search`