ci: remove leftover from gh pages

.github/workflows/pages.yml

@@ -2,29 +2,17 @@ on:
   push:
     branches:
       - main
-  workflow_dispatch:
+  pull_request:
+    branches:
+      - main
 permissions:
   contents: read
-  pages: write
-  id-token: write
-concurrency:
-  group: pages
-  cancel-in-progress: false
 jobs:
   deploy:
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/configure-pages@v5
       - uses: denoland/setup-deno@v1
         with:
           deno-version: v1.x
-      - run: deno task build
-      - uses: actions/upload-pages-artifact@v3
-        with:
-          path: .pages
-      - id: deployment
-        uses: actions/deploy-pages@v4
+      - run: deno task ci