Users of GitLab 12.0 and earlier should be directed to the manual Let's Encrypt instructions

Problem to solve

The current Let's Encrypt instructions only apply to GitLab 12.1. Anyone using GitLab 12.0 and earlier may either give up, or search for the instructions.

Proposal

Anyone landing on this page who is using GitLab 12.0 or earlier should be directed to the manual configuration instructions.