enh: Set up .well-known/assetlinks.json

Author: marcelklehr

static/.well-known/assetlinks.json

@@ -0,0 +1,8 @@
+[{
+  "relation": ["delegate_permission/common.handle_all_urls"],
+  "target": {
+    "namespace": "android_app",
+    "package_name": "org.handmadeideas.floccus",
+    "sha256_cert_fingerprints": ["ffed2778ff07371e6367b6dcf5d7c1327c57ff7158b8444029182a9aa2dd7085"]
+  }
+}]