Overhaul "Migrate to React alternatives"

[kurtextrem]

fixes #8

[googlebot]

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[iamakulov]

Sorry, it’s now me who failed to merge this in time :)

Thanks for the addition, looks really great!

I’ve tuned the text a bit; are these changes OK, or is something off?

• Added exact sizes of Inferno and Nerv, including the compat packages (because such packages would usually be necessary for migration) + changed their order (because of changed sizes)
• Removed the benchmark link (I feel it’s not very relevant because this repo is more about size)
• Reworded the intro paragraph (Suspension isn’t here yet; Fiber is not a feature but rather an architectural solution AFAIK; I also tried to simplify the language a bit to make it cleaner for people with worse English)

→ https://github.com/GoogleChromeLabs/webpack-libs-optimizations/pull/13/commits/9276e0d1d6381fb5ad4dff06671783c3f7dbdb4c

[kurtextrem]

Changes look really good!

[iamakulov]

Thanks for the PR :)