Fix missing docs link

[MattF-NSIDC]

Description

Resolves #747

Checklist

If an item on this list is done or not needed, check it with [x] or click the checkbox.

• [x] The PR description links to issues that it resolves with closes #{issue_number}
• [x] Config lockfile updated (inv config.export > qgreenland/config/cfg-lock.json)
• [x] Environment lockfile updated if needed (conda-lock)
• [x] Version bumped if needed (bumpversion (major|minor|patch|prerelease|build))
• [x] CHANGELOG.md updated (for user-facing changes)
• [x] Documentation updated if needed
• [x] New unit tests if needed

[MattF-NSIDC]

I'm having no build problems locally, so I assume it's a mismatch between the RTD build env and our environments/main/environment.yml... trying to fix.

[MattF-NSIDC]

:tada: that did it