Adjust LAYOUT to correctly state format of README.rst

In ~November 2009, we created README.mkd.

Later, we converted it to reStructuredText and renamed it.
No one fixed LAYOUT... until now!
Remark on origin of vendor/ trick
Encourage harder people to read README
Explain that this is Django-y
Bundle modules for local doc generation

This bundles Sphinx and dependencies so that users don't have to `pip
install Sphinx` or similar when generating documentation locally -- all they
have to do is run `python tools/render_docs.py` from the toplevel
directory.
Explain other bits of Django we use
Bundle dependencies
Merge pull request #154 from paulproteus/feature/longer-layout-file

Explain the LAYOUT of the code better
Merge pull request #155 from mandarg/bundle-sphinx

Bundle Sphinx and dependencies so documentation can be generated locally without needing additional module installs
Update installation.rst

Updated installation instructions to provide additional detail and clarity re: cloning the oh-mainline repository and running the OpenHatch's web server on a local computer
edit documentation.rst, index.rst, added project_overview.rst
Merge pull request #156 from shaunagm/master

improved documentation.rst, added files from prev commit to index.rst to...
Fixed Jira tracker
Merge pull request #157 from willingc/master

Update installation.rst
Merge pull request #152 from Aaron1011/fix_jira

Fixed Jira tracker