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
```

Here are the docs in rendered from this branch:
 * http://build.clusterhq.com/results/list-indentation-446/flocker-1333/docs/

```
$ wget -r http://build.clusterhq.com/results/list-indentation-446/flocker-1333/docs/
$ egrep -R 'blockquote' --files-with-matches build.clusterhq.com/
build.clusterhq.com/results/list-indentation-446/flocker-1333/docs/_static/bootstrap-engineauth.min.css

```

Fixes #446