Evaluate CodeShift codeblocks for ideas
Issue Description
During a recent livestream, it was suggested that we possibly include the use of code blocks that are similar to how RedHat OpenShift does them, with in-code references to "footnote-like" information.
The deliverable for this issue is to determine if this is a useful addition to the GitLab docs site, as well as determining the accessibility and implementation implications of adding this functionality. If a path forward is identified, follow-on steps (for another issue) would handle implementation details.