Use the new Site.global_type column

...instead of global_http_status. This also includes Transition's
current db/structure.sql, which has some bits of accidentally-committed
collation diff, but since that should be sorted out in transition first
I've copied it all over as-is.
Treat unresolved mappings as archived

* No decision has been made
* Rack returns a 410
Add rules to serve devolved businesslink content

This commit attempts to replicate rules behaviour for NI and Wales devolved www.businesslink.gov.uk sites, as initially implemented here https://github.com/alphagov/redirector/blob/master/configs/businesslink.conf#L36

Using a rule here rather than a mapping allows us to avoid adding 'site' as a significant query string parameter, and having to guess / regenerate / recanonicalise all the businesslink mappings to work (for many other URLS, other site numbers and conflating other rules / piplinks / etc)
Refactor pre-emptive rules to be case-based