Add FreshRuntime WWW bundle, remove ESLint

[gaearon]

• Adds Fresh runtime build for www
• Removes ESLint plugin www build because we actually use the Node build on www for it

[sizebot]

Details of bundled changes.

Comparing: e11bf42...383e11b

react-refresh

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-refresh-runtime.development.js	0.0%	0.0%	16.53 KB	16.53 KB	5.08 KB	5.08 KB	NODE_DEV
react-refresh-runtime.production.min.js	0.0%	🔺+0.8%	368 B	368 B	263 B	265 B	NODE_PROD
ReactFreshRuntime-dev.js	n/a	n/a	0 B	16.57 KB	0 B	5.05 KB	FB_WWW_DEV
react-refresh-babel.development.js	0.0%	0.0%	23.17 KB	23.17 KB	5.14 KB	5.14 KB	NODE_DEV
react-refresh-babel.production.min.js	0.0%	🔺+0.1%	6.83 KB	6.83 KB	2.39 KB	2.39 KB	NODE_PROD

Generated by 🚫 dangerJS against 383e11b