Fix Example App for web

[Kicu]

Details

While doing some testing of this library I have found that the Example for web (run via yarn web) was broken because of wrong webpack config.
I have no idea when it broke - it was like that before RN 75 migration and after it as well.
Btw @gedu did you try running it on your end when migrating to 75 here? #228 I wonder why it worked for you and not for me :/

Anyways on clean installs it did not work, and after I add this webpack config it does work.

Also a question - running yarn install on root level generates a yarn.lock file because it was missing. Was this on purpose?

What this fixes

The error:

$ webpack serve
<i> [webpack-dev-server] Project is running at:
[...redacted...]

ERROR in ./node_modules/@react-native/assets-registry/registry.js 13:7
Module parse failed: Unexpected token (13:7)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
| 'use strict';
[...]

So I added a simple webpack loader accepting .js files.

Checklist

• I have described the bug/issue
• I have provided reproduction in Example App
• I have tested that solution works on Example App on all platforms:
  • Android
  • iOS
  • Web

Screenshots/Videos

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[Kicu]

CC @gedu @mountiny @luacmartins please take a look at this

[Kicu]

I have read the CLA Document and I hereby sign the CLA

[Kicu]

Closing after discussing this with @gedu over slack. Everything works correctly when we use npm install at the root level instead of yarn

[Kicu]

Superseded with this: #231 - just a README change needed ;)