Activate Pages setting automatically

[fredrikekre]

A very common error/thing to forget when deploying docs for a new repository is to enable the Pages setting and select the branch in the repo settings. Perhaps Documenter should try to do this with the Github API if GITHUB_TOKEN with sufficient permissions is available. See https://docs.github.com/en/rest/pages/pages?apiVersion=2022-11-28#create-a-github-pages-site

[goerz]

That would be great! Although it seems more like a feature that should be part of the julia-docdeploy GitHub action