Clarify Azure CLI deployment steps in documentation

Updated Deployment.md to explicitly instruct users to run 'azd auth login' in the AppHost root directory before executing 'azd up', ensuring authentication is completed prior to deployment. This improves clarity and streamlines the deployment process.

Author: ADefWebserver

wiki-content/Deployment.md

@@ -62,7 +62,14 @@ The repository includes an `azure.yaml` file in the AppHost project, enabling de
 
 ### One-Command Deployment
 
-The fastest way to deploy is a single command that combines provisioning and deployment:
+The fastest way to deploy is a single command that combines provisioning and deployment.
+
+Navigate to the AppHost root directory and run:
+
+```bash
+azd auth login
+```
+After authenticating, run:
 
 ```bash
 azd up