Set website root in integration to CDN
Set website root in integration to CDN

We've fixed the issue where certain paths weren't loading correctly
so we can now point at the CDN in integration meaning we have
better parity across our environments.

This will also mean the cache-clearing-service is correctly using
Fastly to purge caches in integration.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet