fix: Add write permissions to deployment workflow

This commit adds the `permissions: contents: write` block to the `.github/workflows/deploy.yml` file. This is a critical fix to resolve the "git exit code 128" error that was causing the deployment Action to fail.

By explicitly granting write permissions, the workflow will now be authorized to push the built application to the `gh-pages` branch, allowing the deployment to complete successfully.

.github/workflows/deploy.yml

@@ -8,6 +8,8 @@ on:
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
 
     steps:
       - name: Checkout