Implement screens list UI and copy action

Summary: TSIA, implementation for delete button coming in next diff. Note that Flipper doesn't seem to have a good Toast I could find so this is the best we have at the moment.

Reviewed By: nscoding

Differential Revision: D31496628

fbshipit-source-id: b9f94b3b2e757907b36e93b32d7f61448473a304

desktop/static/icons.json

@@ -603,5 +603,8 @@
   ],
   "app-facebook-circle": [
     16
+  ],
+  "link": [
+    16
   ]
 }