fix: update VS Code Web URL to use stable version

[Kanchan-Microsoft]

Purpose

This pull request updates the Visual Studio Code Web badge links in both the README.md and the deployment guide to point to the latest URL format for opening the project in the browser. These changes ensure users are directed to the correct online editor experience.

Documentation link updates:

• Updated the Visual Studio Code Web badge link in README.md to use the new vscode.dev/azure URL format instead of the previous insiders.vscode.dev/azure format.
• Updated the Visual Studio Code Web badge link in docs/DeploymentGuide.md to use the new vscode.dev/azure URL format.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information