[#519] Update deployment docs

Uses the same directory structure as the updated source install docs, so
you can step through the source install docs and then the deployment
docs as written and it all works.

Also updated the apache.wsgi and sites-available files to match those
that we use on our servers.

Removed CORS setup instructions as this has been builtin since CKAN 1.5.
[#519] Edit source install docs

Minor edits to install from source docs
[#519] Edit solr setup docs

Minor edits to solr setup docs
[#519] Update FileStore setup instructions