Stop mentioning govuk-cli on the Nagstamon page
Stop mentioning govuk-cli on the Nagstamon page

govuk-cli was a failed attempt at moving the `govuk connect` script
out of govuk-guix, so revert to the previous state in the docs.

This reverts commit 9c9cffc5f9d2fde032e293e1f4a36739fe76ef51.

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