App Does Not Work

yarn install
yarn build

```
Error
Could not load javascript './static/js/content.js' for script.
Could not load manifest.
```

```
$ ls build/static/js
787.350caba3.chunk.js
787.350caba3.chunk.js.map
main.bf17f6f8.js
main.bf17f6f8.js.LICENSE.txt
main.bf17f6f8.js.map
```

maybe consider fixing or archiving repository