docs: Update deployment guide and quota check documentation for VS Code Web usage

Author: Avijit-Microsoft

docs/DeploymentGuide.md

@@ -100,9 +100,18 @@ You can run this solution in VS Code Dev Containers, which will open the project
 2. Sign in with your Azure account when prompted
 3. Select the subscription where you want to deploy the solution
 4. Wait for the environment to initialize (includes all deployment tools)
-5. When prompted in the VS Code Web terminal, choose one of the available options shown below:
+5. Once the solution opens, the **AI Foundry terminal** will automatically start running the following command to install the required dependencies:
 
-   ![VS Code Initial Prompt](./images/vscodeweb_intialize.png)
+    ```shell
+    sh install.sh
+    ```
+    During this process, you’ll be prompted with the message:
+    ```
+    What would you like to do with these files?
+    - Overwrite with versions from template
+    - Keep my existing files unchanged
+    ```
+    Choose “**Overwrite with versions from template**” and provide a unique environment name when prompted.
 6. Continue with the [deploying steps](#deploying-with-azd)
 
 </details>

docs/images/vscodeweb_intialize.png

@@ -5,9 +5,12 @@ Before deploying the accelerator, **ensure sufficient quota availability** for t
 
 ### Login if you have not done so already
 ```
-azd auth login
+az login
+```
+If using VS Code Web:
+```
+az login --use-device-code
 ```
-
 
 ### 📌 Default Models & Capacities:
 ```
@@ -75,7 +78,7 @@ The final table lists regions with available quota. You can select any of these
 
 ### **If using VS Code or Codespaces**
 1. Open the terminal in VS Code or Codespaces.
-2. If you're using VS Code, click the dropdown on the right side of the terminal window, and select `Git Bash`.
+2. If you're using VS Code, click the dropdown on the right side of the terminal window, and select `Git Bash` / `bash`.
    ![git_bash](images/read_me/git_bash.png)
 3. Navigate to the `scripts` folder where the script files are located and make the script as executable:
    ```sh
@@ -97,4 +100,5 @@ The final table lists regions with available quota. You can select any of these
     curl -sL https://aka.ms/InstallAzureCLIDeb | sudo bash
     az login
     ```
+    > Note: Use `az login --use-device-code` in VS Code Web.
 6. Rerun the script after installing Azure CLI.