ci: switch to new pages workflow (#6)

.github/workflows/docs.yml

@@ -1,4 +1,4 @@
-name: GitHub Pages
+name: Deploy Docs
 
 on:
   push:
@@ -7,11 +7,13 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     permissions:
-      contents: write
-    concurrency:
-      group: ${{ github.workflow }}-${{ github.ref }}
+      id-token: write
+      pages: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deploy.outputs.page_url }}
     steps:
       - uses: actions/checkout@v4
 
@@ -22,8 +24,11 @@ jobs:
       - name: Build Docs
         run: nimble docs
 
-      - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./public
+          path: "public/"
+
+      - name: Deploy artifact to GitHub Pages
+        id: deploy
+        uses: actions/deploy-pages@v4