Remove 'How government works'

This page is already in the government index. That should be the canonical
source for these links.

Secondly we were duplicating the link here, although that should have had no
effect.
Deduplicate some inside gov links

These are all found in the ``publication-links.csv`` file as well.
Duplicating them offers no benefit.
Merge pull request #12 from alphagov/remove_redundant_inside_gov_links

Remove redundant inside gov links