Link to GET documentation

What does this MR do?

We're updating the GitLab Environment Toolkit (GET) documentation to include deploying FIPS enabled environments, so updating fips_compliance.md to link to that documentation so we have one SSOT.

Related issues

corresponding GET MR: gitlab-environment-toolkit!1008 (closed) - decided not to be SSOT location, leaving here for reference

corresponding internal handbook MR: https://gitlab.com/internal-handbook/internal-handbook.gitlab.io/-/merge_requests/2892 - new SSOT location

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