chore: update GitHub Pages workflow and docs

Author: shijiashuai

.github/workflows/ci.yml

@@ -6,6 +6,13 @@ on:
   pull_request:
     branches: [main, master]
 
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-latest

.github/workflows/pages.yml

@@ -23,6 +23,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          sparse-checkout: |
+            docs
 
       - name: Setup Pages
         uses: actions/configure-pages@v5