Increase disk space on mirrorer-1
Increase disk space on mirrorer-1

The size of the site we're pulling is now becoming sufficiently large
that we need to increase the default size of the crawler mount (50GB).
This commit adds a new disk to increase the size of this mount.

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