Merge pull request #527 from rjc123/newmappings

Configure Defra mappings for import to bouncer
Configure ahvla.defra.gov.uk as alias to global 301
Move VLA site to transition app
Config legacy domain to point to archive
Configure DEFRA Emissions Trading Registry legacy site
Configure DEFRA UK Climate Projections legacy domain
Configure DEFRA engage domain for archive
Configure DEFRA ecicence subdomain for archive