Remove unnecessary steps for non-visible files
Remove unnecessary steps for non-visible files

Previously these steps would only remove the asset from hidden parts
of the file system, which does not change the overall outcome: there
may be many such files that have not been cleaned up after upload,
but none of these are visible to the user.

alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs