Remove no longer needed index.web.dev.html

Summary: This is a duplicate, is not needed, causes confusion.

Reviewed By: aigoncharov

Differential Revision: D51307091

fbshipit-source-id: 4d55d727ea5f20100ecd15ad6e23aa0c01722524

desktop/app/src/init.tsx

@@ -143,7 +143,7 @@ async function getFlipperServer(
   const {readyForIncomingConnections} = await startServer(
     {
       staticPath,
-      entry: 'index.web.dev.html',
+      entry: 'index.web.html',
       port,
     },
     environmentInfo,