Functionality deprecation L09T4

The instructions for creating a function app have to be changed, as in-process model is going to be retired in Nov 2026. Still a year to go, but this issue should be addressed asap, so we're not training stuff that's soon deprecated.

<img width="1468" height="218" alt="Image" src="https://github.com/user-attachments/assets/af40ebd4-9e59-47b2-b73e-699f8a02a1e1" />