[Feature] Generate API reference docs for Strix Music App

[Arlodotexe]

Describe the problem

In our published documentation, we only generate documentation for C# classes for the SDK.

Describe the proposed change

Now that we have proper top-level app infrastructure, we need the ability to reference these models from documentation. To make this possible, we need to

• [ ] Rename the root namespace for the Shared project to StrixMusic.App, and adjust the namespaces in all files.
• [ ] Set up docfx to generate API documentation for the models in the shared project

Alternatives

No response

Additional info

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Help us help you

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[Arlodotexe]

This has been removed from the 0.1.0 milestone to allow us to polish and ship the update faster