Fix various incorrect indentation which was being rendered as block quotes - fixes 446

These are the files which used to have <blockquote> tags

```
$ wget -r http://docs.clusterhq.com
$ egrep -R 'blockquote' --files-with-matches docs.clusterhq.com
docs.clusterhq.com/en/latest/roadmap/volume-manager.html
docs.clusterhq.com/en/latest/gettinginvolved/infrastructure/release-process.html
docs.clusterhq.com/en/latest/gettinginvolved/contributing.html
docs.clusterhq.com/en/latest/advanced/configuration.html
docs.clusterhq.com/en/latest/gettingstarted/tutorial/vagrant-setup.html
docs.clusterhq.com/en/latest/gettingstarted/installation.html
docs.clusterhq.com/en/latest/_static/bootstrap-engineauth.min.css
``

Fixes #446