Remove github action based build method to simplify

[zorp]

The following needs to be done to remove github action based build and prepare the repo for branch based build method.

• Update config to use remote theme the correct way. Example here: https://github.com/os2git/test-os2-docs/blob/main/_config.yml
• Remove gem file
• Remove jekyll yml in workflows
• Also update documentation with deploy from branch information.

[janhalen]

In the official docs for the just-the-docs theme that we are using it states:

the created site uses a gem-based approach, i.e. uses a Gemfile and loads the just-the-docs gem
uses the GitHub Pages / Actions workflow to build and publish the site on GitHub Pages

So even though this would on the surface seem to simplify the amount of automation code in this repo, it would also break the rendering... We need to keep and maintain a .yaml file in the .github/workflows folder to do this...

[janhalen]

When i get a bit more time, I can try and look into how it could be done simpler, without the github action.

[zorp]

Thank you - let's keep it simple on our side. Then complexity can be added in projects that need the complexity :)