Sovereign Cloud update

[janegilring]

This pull request updates the README.md for the demo VM creator to address storage limitations and clarify deployment steps. The most significant change is the addition of detailed instructions for expanding UserStorage volumes to prevent VM creation failures when multiple attendees are using the system. The deployment and configuration steps have also been updated for clarity.

UserStorage Expansion Instructions:

• Added a new section, "Step 4: Expand UserStorage Volumes", providing a two-part guide for adding 1 TB data disks to each Azure Local node and expanding the storage pool and volumes. This includes PowerShell scripts and screenshots to assist with the process.

Deployment and Configuration Flow:

• Updated the subsequent steps to reflect the new process, shifting the environment configuration to "Step 5" and environment testing to "Step 6" to accommodate the new storage expansion step. [1] [2]