fix(#67): restrict cleartext traffic to local subnets and Tailscale range (#178)

app/src/main/AndroidManifest.xml

@@ -14,7 +14,7 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:usesCleartextTraffic="true"
+        android:networkSecurityConfig="@xml/network_security_config"
         android:theme="@style/Theme.HermesControl">
         <activity
             android:name=".MainActivity"