Summary: The current UI for managing mock network request definitions (routes) has some issues - too small for the amount of information it displays - no formatting for JSON response bodies - uses the older design system (not ant) - no separation between commands for creating routes and the list of routes The following screen images show these problems.   ## Changelog Enhance UI for Mocks dialog in Network Plugin Pull Request resolved: https://github.com/facebook/flipper/pull/1831 Test Plan: Ran multiple manual tests using the Android sample app. Here is a screen image (at 1280 x 720) for the enhanced UI.  Reviewed By: mweststrate Differential Revision: D25922798 Pulled By: priteshrnandgaonkar fbshipit-source-id: d27ba30a7eb51105a8d381097ecaafd82624cad5