Improve PWA support.

.github/workflows/ci.yml

@@ -1,18 +1,18 @@
 name: Build and Lint
 
 on:
-  pull_request:
-  push:
+    pull_request:
+    push:
 
 jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2.4.0
-      - name: Setup Node.js
-        uses: actions/setup-node@v2.5.1
-        with:
-          cache: "yarn"
-      - run: yarn install --prefer-offline
-      - run: yarn build
-      - run: yarn lint --no-fix
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2.4.0
+            - name: Setup Node.js
+              uses: actions/setup-node@v2.5.1
+              with:
+                  cache: "yarn"
+            - run: yarn install --prefer-offline
+            - run: yarn build
+            - run: yarn lint --no-fix