Add various improvements (#19)

* Add white stroke to icon

* Add lint workflow

* Add build workflow

* Add support for firefox android

.github/workflows/lint.yaml

@@ -0,0 +1,22 @@
+name: "Lint"
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  lint:
+    name: "Lint"
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 16
+          cache: 'npm'
+          cache-dependency-path: package-lock.json
+      - run: npm ci
+      - run: npm run lint