CI: Use actions/setup-node instead of the Eleventy action

The TartanLlama/actions-eleventy action spins up a Docker container
unneedlessly, which defeats usage of actions/cache. By manually using
actions/setup-node the cache will be useful and the Docker usage
avoided. This should make CI runs faster.

.github/workflows/dev.yml

@@ -9,17 +9,24 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+      - name: Setup Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: '14.x'
       - name: Checkout
         uses: actions/checkout@v2
       - name: Cache Node modules
         uses: actions/cache@v2
         with:
           path: ~/.npm
           key: npm-${{ runner.os }}-${{ hashFiles('package-lock.json') }}
+          restore-keys: |
+            npm-${{ runner.os }}-
+            npm-
+      - name: Install Node modules
+        run: npm install
       - name: Eleventy
-        uses: TartanLlama/[email protected]
-        with:
-          install_dependencies: true
+        run: ./node_modules/.bin/eleventy
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
         with: