docs: updated env in readme local setup

[Priyanka-Microsoft]

Purpose

• ...
  This pull request updates the deployment documentation to reflect changes in the infrastructure deployment process and clarifies instructions for environment variable setup. The main improvements are updating the Bicep deployment file paths and providing clearer guidance for managing the .env file during setup.

Deployment process updates:

• Changed the Azure CLI deployment command in both docs/DeploymentGuide.md and docs/LocalDeployment.md to use infra/main.bicep instead of the outdated deploy/macae-dev.bicep path, ensuring consistency with the current infrastructure setup. [1] [2]

Environment variable setup clarification:

• Added instructions in docs/DeploymentGuide.md on how to update the .env file with values from Azure App Service environment variables, and noted that if resources are provisioned with azd, the .env file is auto-generated and its location can be found using azd env list.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[github-actions]

🎉 This PR is included in version 2.2.0 🎉

The release is available on GitHub release

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