feat(onboarding): add cookbook instructions for VMs

docs/hackathon/0-onboarding.mdx

@@ -1,6 +1,6 @@
 ---
 sidebar_position: 1
-unlisted: true
+unlisted: false
 slug: onboarding
 title: Onboarding
 description: Step-by-step guide for setting up infrastructure, credentials, and cloud instances for the Verifiable AI Hackathon.
@@ -151,13 +151,33 @@ VM instances in `verifiable-ai-hackathon` are continuously monitored.
 
 - **gcloud CLI Authentication Problems:**
 
-  - Run `gcloud auth login --no-launch-browser` if the browser auth flow fails
+  - If the browser auth flow fails:
+
+    ```bash
+    gcloud auth login --no-launch-browser
+    ```
+
   - Check if you have multiple Google accounts in your browser and select the correct one
 
 - **Windows-specific gcloud issues**
+
   - On Windows, when installing the gcloud CLI, gcloud installs its own basic shell as well.
   - We recommend using [git BASH](https://gitforwindows.org) for access to a full set of linux commands.
 
+- **Multiple GCP Projects**
+
+  - Set `verifiable-ai-hackathon` as default GCP project:
+
+    ```bash
+    gcloud config set project verifiable-ai-hackathon
+    ```
+
+  - Set quota to use `verifiable-ai-hackathon`:
+
+    ```bash
+    gcloud auth application-default set-quota-project verifiable-ai-hackathon
+    ```
+
 ## Need Help?
 
 If you're stuck, reach out to the Flare team on [Telegram](https://t.me/+StI5VEIvtIg2ODlh). Include: