Process for adding or removing pages in language docs is unclear

[bamarsha]

To get the language docs to show up in the user guide at https://docs.microsoft.com/en-us/azure/quantum/user-guide/, there are stubs and a UID mapping defined for each page here: https://github.com/MicrosoftDocs/quantum-docs/tree/main/articles/user-guide/language

However, if pages are added or removed, the stubs don't seem to be updated automatically. It's not clear to me what the process is for updating them and it doesn't seem to be described in this repo. I think it would be better to:

• Document clearly how this other repo is supposed to be updated so that people making changes to the Q# docs here will know what to do.
• Update the CI to prevent merging PRs that add or remove pages without updating the corresponding stubs/UID map (like Document lambda expressions #136).

[bamarsha]

@bettinaheim do you have any thoughts on the process and how to prevent the docs repo from becoming out of sync?

[bamarsha]

And just to clarify/rephrase, but my understanding of the situation is:

1. To update the contents of existing pages, only this repo needs to be changed.
2. To add, remove or rename pages, both this repo and quantum-docs need to be changed simultaneously.

IMO this split is kind of weird, and ideally I'd prefer everything to be done all in one repo. Or it would be nice if it was clearly documented and checked in CI for the second case.