feat: remove CDN

[agliga]

Description

This PR removes all the CDN changes and uses a github action to run npm run build and then deploy to Github pages

• I verify the build is in a non-broken state
• I verify all changes are within scope of the linked issue

NOTE, the jekyll actions is generated from github directly. The only thing I added was the nodejs and npm run build step which will generate the static directory. If there are issues with ruby on github (Since we always have issues with ruby locally) we can always just build the CSS part only.

[ianmcburnie]

Looks good to me. Maybe also check for any old Jekyll vars that are no longer needed, like cdn_path.

We can probably also leverage this to build previews of upcoming releases... although maybe less relevant if we are moving to trunk based development.