Replace yamllint with yaml-lint

What does this MR do and why?

As noted at: !39 (comment 1819620996), it can be tricky to get yamllint set up correctly.

Instead, we can use an Node.js package (yaml-lint) which is trivial for folks to set up and allows us to have an SSoT for the version.

CC @axil

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Configure a local GitLab Docs environment: https://gitlab.com/gitlab-org/technical-writing-group/gitlab-docs-hugo/-/blob/main/doc/setup.md.
2. Check out this branch.
3. Render any of the YAML files in the project invalid.
4. Run make lint-yaml. You should get an error.
5. Reverse the changes made to YAML files.
6. Run make lint-yaml. You should get no error.

Merge request acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this merge request.