Flipper as PWA

Summary:
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Reference: https://docs.google.com/document/d/1flQJUzTe4AuQz3QCpvbloQycenHsu7ZxbKScov7K7ao

Reviewed By: passy

Differential Revision: D45693382

fbshipit-source-id: 5a2e6c213a7e7e2cf9cd5f3033cff3e5291a2a92

desktop/scripts/build-flipper-server-release.tsx

@@ -224,6 +224,9 @@ async function copyStaticResources(outDir: string, versionNumber: string) {
     'icons.json',
     'index.web.dev.html',
     'index.web.html',
+    'manifest.json',
+    'offline.html',
+    'service-worker.js',
     'style.css',
   ];
   if (isFB) {