chore: Update deploy workflow to exclude pull requests

Author: k-miyake

.github/workflows/deploy.yml

@@ -2,8 +2,6 @@ name: Deploy to Cloudflare with NuxtHub Cli
 on:
   push:
     branches: [main]
-  pull_request:
-    branches: [main]
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest