Merge pull request #804 from rjc123/newsites

Revise homepages for PHE PAGs
Make 4 fake tna_timestamps the right length

When these were imported with 2 extra digits, they were silently
coerced to '0000-00-00 00:00:00' in the database, which is then
treated as nil by Rails, which caused errors on their site dashboards
in Transition.
Merge pull request #806 from alphagov/make_timestamps_right_length

Make 4 fake tna_timestamps the right length
Fix actonco2 abbr

The abbr was inconsistent with the filename, but was also breaking transition
as it uses the abbr in it's URLs for a site, and Rails thinks the full stop
indicates a format/file extension.
Merge pull request #807 from alphagov/fix_actonco2_abbr

Fix actonco2 abbr
Configure oisc on transition tool