Update docs/documentation/install/introduction.md
Update docs/documentation/install/introduction.md

Co-Authored-By: soupdragon99 <4b8f3aa9f3ec17ba3eb3b4f67435f5db164c6941@users.noreply.github.com>
dwpdigitaltech/hrt-prototype,alphagov/govuk_prototype_kit,dwpdigitaltech/hrt-prototype,alphagov/govuk_prototype_kit,alphagov/govuk_prototype_kit,dwpdigitaltech/hrt-prototype