ci: fix GitHub Pages deployment configuration

- Update trigger branch from main to master to match repository default
- Resolve deployment branch protection error by using correct branch name
- Allow VitePress site deployment to proceed without branch restrictions

Author: watzon

.github/workflows/deploy.yml

@@ -3,10 +3,9 @@
 name: Deploy VitePress site to Pages
 
 on:
-  # Runs on pushes targeting the `main` branch. Change this to `master` if you're
-  # using the `master` branch as the default branch.
+  # Runs on pushes targeting the `master` branch.
   push:
-    branches: [main]
+    branches: [master]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch: