Fix links to Microsoft Learn + Minor Formatting Updates

[ckittel]

• Fixed links to Microsoft Learn
  • docs.microsoft.com -> learn.microsoft.com
  • remove en-us
  • resolve redirects
• AKS workshop is no longer a thing. Remove links to it. @mosabami the repo behind it https://github.com/MicrosoftDocs/mslearn-aks-workshop-ratings-api is subject to delete as it is no longer maintained. If you use it, please bring in a copy to your repo. This dependency could break any moment.
• Fixed some formatting issues I saw along the way

No functional changes.