added ads.txt

modified config to add adtest page

frontend/firebase.json

@@ -19,6 +19,10 @@
         "source": "/security-policy",
         "destination": "/security-policy.html"
       },
+      {
+        "source": "/adtest",
+        "destination": "/adtest.html"
+      },
       {
         "source": "**",
         "destination": "/index.html"

frontend/webpack/config.base.js

@@ -12,6 +12,7 @@ const htmlWebpackPlugins = [
   "privacy-policy",
   "email-handler",
   "das",
+  "adtest",
 ].map((name) => {
   return new HtmlWebpackPlugin({
     filename: `${name}.html`,