Merge pull request #826 from rjc123/newsites

Configure 3 new cabinet office subdomains
Change the homepage for ELPS
Merge pull request #828 from alphagov/change_homepage_for_equitable_life_payment_scheme

Change the homepage for ELPS
Merge pull request #827 from rjc123/newsites

Configure TLD rewrite for RPA
Merge pull request #829 from rjc123/newsites

Configure legacy pension domain on the transition tool
Merge pull request #830 from rjc123/newsites

Add DTI TLD to redirector
Merge pull request #832 from rjc123/newsites

Change date of legacy corporate BIS sites to match BIS site
Improve README for site yaml files
Merge pull request #831 from alphagov/improve_docs_for_site_yaml_files

Improve README for site yaml files
Update fURLs to ones which work

The furls which didn't work wouldn't break any user journeys, because we only
ever use them for link text.

I removed one or two which didn't seem appropriate.
Merge pull request #833 from alphagov/remove_non_working_furls

Correct furls which don't work or aren't appropriate
Reinstate businesslink homepage redirection

The businesslink homepages are not being redirected, and are returning 404
instead. This reinstates what I think was doing this redirect. It was removed
in: 3b5ad00bc1c894757ab21d3a123e802bcc816c56
Merge pull request #836 from rjc123/newsites

Unpublish directgov asset
Merge pull request #835 from alphagov/fix_businesslink_homepage_redirection

Reinstate businesslink homepage redirection
Increase redirector test coverage for businesslink and businesslink subdomains