fix: improve README post-deployment instructions for non-technical users

- Simplify jargon-heavy description to plain language
- Remove unnecessary az login step (Cloud Shell is already authenticated)
- Add tip explaining how to find the resource group name
- Bold step titles for better scannability

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Abdul-Microsoft

README.md

@@ -201,16 +201,17 @@ Select either "PostgreSQL" or "Cosmos DB":
 
 When Deployment is complete:
 
-1. Run the post-deployment setup script to configure the Function App client key and create PostgreSQL tables (if applicable). Open [Azure Cloud Shell](https://shell.azure.com) (Bash) and run:
+1. **Run the post-deployment setup script** to finish configuring your application. Open [Azure Cloud Shell](https://shell.azure.com) and select **Bash**, then run the following commands:
 
     ```bash
-    az login
     git clone https://github.com/Azure-Samples/chat-with-your-data-solution-accelerator.git
     cd chat-with-your-data-solution-accelerator
     bash scripts/post_deployment_setup.sh "<your-resource-group-name>"
     ```
 
-2. Follow steps in [Set Up Authentication in Azure App Service](./docs/azure_app_service_auth_setup.md) to add app authentication to your web app running on Azure App Service
+    > **💡 Tip:** Replace `<your-resource-group-name>` with the name of the resource group created during deployment. You can find it in the [Azure Portal](https://portal.azure.com/) under **Resource Groups**, or from the deployment output in your terminal.
+
+2. **Set up authentication** by following [Set Up Authentication in Azure App Service](./docs/azure_app_service_auth_setup.md) to secure your web application
 
 **Note**: The default configuration deploys an OpenAI Model "gpt-4.1" with version 2025-04-14. However, not all
 locations support this version. If you're deploying to a location that doesn't support version 2024-05-13, you'll need to