Incorporate mappings from DFE pages to redirector
Configure DFE legacy subdomains to global 301 to discontinuation notice
Add aliases to DFE
Amend redirector whitelist to accommodate DFE internal mappings
Add TLD config for DFE domains
Merge pull request #557 from rjc123/newmappings

Initial configuration of DFE mappings into redirector, whitelist updates and new sites.