Remove organisations from the inside gov links

These are artificially put at the top of mainstream results if they are
returned at all for a given search, so they often end up pushing down useful
results (eg 'Planning Inspectorate' appears above 'Write a business plan'.
Secondly, we are being inconsistent as this is only 5 of the 24 departments and
300 agencies that we support/will need to support.

See:
https://www.pivotaltracker.com/s/projects/367813/stories/45604757
and:
https://www.pivotaltracker.com/story/show/50430663