Remove microsites cruft

These were intended for Transition to consume, and I think transition-old did.
I don't believe redirector ever used them.
Merge pull request #817 from rjc123/newmappings

Add ONS and statistics.gov.uk as new sites
Change the transition date of the DCLG Planning Portal site to December
Change the transition date of the Government Chemist to July 31st
Merge pull request #819 from alphagov/change_date_of_government_chemist

Change the transition date of the Government Chemist to July 31st
Merge pull request #818 from alphagov/change_date_of_dclg_planning_portal

Change the transition date of the DCLG Planning Portal site to December
Configure mod_ssmt on transition tool
Add stub timestamp for mod_ssmt
Merge pull request #820 from rjc123/newsites

Configure mod_ssmt on transition tool
Update IIAC webarchive timestamp
Merge pull request #821 from rjc123/newsites

Update IIAC webarchive timestamp
Merge pull request #805 from alphagov/remove_microsites_cruft

Remove microsites cruft
Configure Committee on Standards in Public Life on Transition Tool
Configure veterans-uk.info on Transition Tool
Merge pull request #822 from rjc123/newsites

Three new sites for configuration
Configure DCLG legacy sites
Merge pull request #823 from rjc123/newsites

Configure DCLG legacy sites
Resolve zendesk ticket with new mappings for HMCTS
Merge pull request #824 from rjc123/newsites

Resolve zendesk ticket with new mappings for HMCTS
Configure TLDs for SCE sites