Add department for environment agency dashboard
Remove housing dashboard as it shouldnt exist
Make department name consistent

All other dashboards use 'and' rather than '&'
Remove empty metadata section
Merge pull request #790 from alphagov/pre-migration-config-cleanup

Fix config pre migration
Combine "16-17" and "18-24" on register-to-vote

This has been requested by somebody. Speak to @mharrington
for more information.
Update slug to match the filename

I ran this -

`for file in app/support/stagecraft_stub/responses/**/*.json; do SLUG=$(cat $file | jq .slug | sed s/\"//g); NAME=$(basename $file); if [[ "${NAME%.*}" != $SLUG ]]; then echo ${NAME%.*}; echo $file; echo $SLUG; fi; done`

And all other filenames matched the slug. This also isnt a valid slug,
so fails the import
Merge pull request #792 from alphagov/rename-hmrc-prototype

Update slug to match the filename
Merge pull request #791 from alphagov/register-to-vote-combine-ages

Combine "16-17" and "18-24" on register-to-vote