Remove JS tracking nginx config for frontend
Remove JS tracking nginx config for frontend

This was added in https://github.com/alphagov/govuk-puppet/pull/5624 to
support the JS/No-JS tracking experiment, which we're removing.

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