feat: rewrite to use app config and rework docs (#143)

Co-authored-by: Daniel Roe <daniel@roe.dev>
Co-authored-by: Sébastien Chopin <seb@nuxt.com>

.github/workflows/ci-dev.yml

@@ -15,10 +15,10 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest] # macos-latest, windows-latest
-        node: [16]
+        node: [18]
 
     steps:
-      - uses: actions/setup-node@v2
+      - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node }}
 
@@ -29,7 +29,7 @@ jobs:
           fetch-depth: 0
 
       - name: Cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: node_modules
           key: ${{ matrix.os }}-node-v${{ matrix.node }}-deps-${{ hashFiles(format('{0}{1}', github.workspace, '/yarn.lock')) }}