Merge pull request #600 from rjc123/newmappings

Configure new sites on transition
Configure charity commission on transition app
Add aliases to main defra site
Configure additional alias for EA main domain
Configure Insolvency Service legacy domain on transition
[EA] Update publications TNA timestamp

The timestamp we currently have is much older, this new one will:
* have PDF links which end up at the cdn.environment-agency.gov.uk URLs which
  are archived by TNA, rather than the rackcdn.com URLs which are not archived
  by TNA.
* have coverage of documents published between the two dates
Merge pull request #596 from rjc123/newsites

Configure new sites to transition
Merge pull request #601 from rjc123/newmappings

Configure DCLG Local Government Finance on transition app
Merge pull request #602 from alphagov/update_ea_publications_tna_timestamp

[EA] Update publications TNA timestamp