Updating/work-with this template for Azd Devcontainer feature.

[zedy-wj]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

We are updating this template to support new features in Azd Devcontainer.

For the Azd Devcontainer feature: We will add the following code in devcontainer.json file.

"ghcr.io/azure/azure-dev/azd:latest": {}

And remove the relevant code for installing azd in Dockerfile under .devcontainer folder.

RUN curl -fsSL https://aka.ms/install-azd.sh | bash \

@rajeshkamal5050 , @paulyuk , @greenie-msft for notification.