Refreshed design.
Refreshed design.

Summary:
This is #12292, but squashed into a single commit. This should help land the PR cleanly, as the commit history for #12292 was in a bad state: see how 1cbf79d456172c1d348a925d32a7f817df4aaf4b expects `"mkdirp": "^0.5.1"` in `package.json`, but the earlier 66920e4e4b04174d63834d6220c4da76453f27a2 had changed this to `"mkdirp": "*",`.

Verified the website built and run.
Confirmed docs, apis, components were generated.
Confirmed landing page, showcase, blog, docs, help page all load and look as expected.
Closes https://github.com/facebook/react-native/pull/12575

Differential Revision: D4617979

Pulled By: hramos

fbshipit-source-id: 86e2d0b36ccd25fc7f2e9f3b1351f97e7ba64d57

janicduplessis/react-native,ndejesus1227/react-native,aljs/react-native,pandiaraj44/react-native,csatf/react-native,CodeLinkIO/react-native,formatlos/react-native,clozr/react-native,tsjing/react-native,clozr/react-native,DanielMSchmidt/react-native,happypancake/react-native,Maxwell2022/react-native,lprhodes/react-native,kesha-antonov/react-native,skevy/react-native,gilesvangruisen/react-native,javache/react-native,Livyli/react-native,happypancake/react-native,hammerandchisel/react-native,Swaagie/react-native,dikaiosune/react-native,gilesvangruisen/react-native,PlexChat/react-native,Guardiannw/react-native,dikaiosune/react-native,Bhullnatik/react-native,mironiasty/react-native,tszajna0/react-native,chnfeeeeeef/react-native,imjerrybao/react-native,jevakallio/react-native,Ehesp/react-native,cpunion/react-native,javache/react-native,hammerandchisel/react-native,lprhodes/react-native,thotegowda/react-native,jevakallio/react-native,formatlos/react-native,Guardiannw/react-native,Guardiannw/react-native,PlexChat/react-native,Livyli/react-native,makadaw/react-native,skevy/react-native,CodeLinkIO/react-native,Guardiannw/react-native,exponent/react-native,jasonnoahchoi/react-native,makadaw/react-native,Maxwell2022/react-native,cpunion/react-native,mironiasty/react-native,PlexChat/react-native,jevakallio/react-native,orenklein/react-native,myntra/react-native,tsjing/react-native,formatlos/react-native,brentvatne/react-native,DanielMSchmidt/react-native,CodeLinkIO/react-native,imDangerous/react-native,Swaagie/react-native,chnfeeeeeef/react-native,tszajna0/react-native,javache/react-native,brentvatne/react-native,adamjmcgrath/react-native,negativetwelve/react-native,Swaagie/react-native,Livyli/react-native,javache/react-native,peterp/react-native,makadaw/react-native,frantic/react-native,DanielMSchmidt/react-native,skevy/react-native,hammerandchisel/react-native,jasonnoahchoi/react-native,cdlewis/react-native,ptomasroos/react-native,clozr/react-native,doochik/react-native,aljs/react-native,cdlewis/react-native,Bhullnatik/react-native,Ehesp/react-native,facebook/react-native,CodeLinkIO/react-native,arthuralee/react-native,doochik/react-native,CodeLinkIO/react-native,csatf/react-native,alin23/react-native,peterp/react-native,chnfeeeeeef/react-native,rickbeerendonk/react-native,happypancake/react-native,tszajna0/react-native,alin23/react-native,lprhodes/react-native,tsjing/react-native,alin23/react-native,ptomasroos/react-native,javache/react-native,CodeLinkIO/react-native,mironiasty/react-native,jasonnoahchoi/react-native,orenklein/react-native,imDangerous/react-native,cdlewis/react-native,frantic/react-native,lprhodes/react-native,ndejesus1227/react-native,negativetwelve/react-native,adamjmcgrath/react-native,farazs/react-native,dikaiosune/react-native,negativetwelve/react-native,farazs/react-native,Swaagie/react-native,cdlewis/react-native,exponent/react-native,jevakallio/react-native,doochik/react-native,Swaagie/react-native,makadaw/react-native,tsjing/react-native,farazs/react-native,mironiasty/react-native,forcedotcom/react-native,hoastoolshop/react-native,imDangerous/react-native,myntra/react-native,ptomasroos/react-native,pandiaraj44/react-native,farazs/react-native,frantic/react-native,cpunion/react-native,makadaw/react-native,adamjmcgrath/react-native,cpunion/react-native,farazs/react-native,dikaiosune/react-native,aljs/react-native,kesha-antonov/react-native,janicduplessis/react-native,exponentjs/react-native,tsjing/react-native,Livyli/react-native,dikaiosune/react-native,exponent/react-native,skevy/react-native,ndejesus1227/react-native,hoangpham95/react-native,hammerandchisel/react-native,DanielMSchmidt/react-native,arthuralee/react-native,Ehesp/react-native,ptmt/react-native-macos,farazs/react-native,shrutic/react-native,hammerandchisel/react-native,skevy/react-native,DanielMSchmidt/react-native,pandiaraj44/react-native,orenklein/react-native,dikaiosune/react-native,jevakallio/react-native,csatf/react-native,exponent/react-native,shrutic123/react-native,ndejesus1227/react-native,janicduplessis/react-native,exponentjs/react-native,javache/react-native,ptomasroos/react-native,Bhullnatik/react-native,csatf/react-native,Guardiannw/react-native,pandiaraj44/react-native,formatlos/react-native,hoangpham95/react-native,doochik/react-native,orenklein/react-native,formatlos/react-native,exponentjs/react-native,janicduplessis/react-native,peterp/react-native,Livyli/react-native,Ehesp/react-native,peterp/react-native,jevakallio/react-native,doochik/react-native,rickbeerendonk/react-native,csatf/react-native,exponent/react-native,javache/react-native,arthuralee/react-native,PlexChat/react-native,CodeLinkIO/react-native,Bhullnatik/react-native,hoangpham95/react-native,gilesvangruisen/react-native,kesha-antonov/react-native,farazs/react-native,tszajna0/react-native,Ehesp/react-native,thotegowda/react-native,ndejesus1227/react-native,frantic/react-native,ptomasroos/react-native,happypancake/react-native,shrutic/react-native,o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