Deploy documentation with Documenter

[Krastanov]

This was an AI-generated PR as I was cleaning up some CI-related setups in this github org. I have vetted it and it should be good to merge. Now each PR will also have a documentation draft generated and posted as well, for review before merge. Below is the original AI generated description.

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Summary

• deploy the existing Documenter site to this repository with pull-request previews
• run documentation deployment for main, tags, and pull requests
• use the organization-standard julia-actions/julia-docdeploy workflow with both GITHUB_TOKEN and DOCUMENTER_KEY
• let TagBot authenticate with the same Documenter SSH key so tag pushes trigger versioned docs

A matched repository secret and verified writable deploy key were installed before this PR was opened.

Validation

• instantiated the docs environment with Genqo developed locally
• built docs/make.jl successfully with Documenter 1.17
• parsed both changed workflows as YAML
• git diff --check

[JacobGunnell]

These changes look great. Thank you!