Divorce router and diagnostics from common.

This means we do not need to deploy these things every time we change common.
Divorce router and diagnostics from common.

This means we do not need to deploy these things every time we change common.
Merge branch 'amicable-divorce' of github.com:guardian/frontend into amicable-divorce
Merge pull request #1637 from guardian/amicable-divorce

Divorce router and diagnostics from common.