restore favicon

app/rest/static/manifest.json

@@ -0,0 +1,22 @@
+{
+  "id": "/grocery",
+  "name": "Grocery Manager",
+  "short_name": "Grocery",
+  "description": "View trending price data and tracked product info",
+  "start_url": "/grocery/trend",
+  "theme_color": "firebrick",
+  "background_color": "black",
+  "display": "standalone",
+  "icons": [
+    {
+      "src": "/grocery/static/favicon.svg",
+      "sizes": "any",
+      "purpose": "any"
+    },
+    {
+      "src": "/grocery/static/favicon_square.svg",
+      "sizes": "any",
+      "purpose": "any"
+    }
+  ]
+}