have the service-worker precache files in public/

Author: chee

packages/react-scripts/config/webpack.config.prod.js

@@ -343,6 +343,10 @@ module.exports = {
       navigateFallbackWhitelist: [/^(?!\/__).*/],
       // Don't precache sourcemaps (they're large) and build asset manifest:
       staticFileGlobsIgnorePatterns: [/\.map$/, /asset-manifest\.json$/],
+      // Precache files in public/, and allow them to be accessed directly
+      staticFileGlobs: ['./public/**/*'],
+      mergeStaticsConfig: true,
+      stripPrefix: './public',
     }),
     // Moment.js is an extremely popular library that bundles large locale files
     // by default due to how Webpack interprets its code. This is a practical