migrate Ethereum history page from ethdocs.org#5935

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jmcook1186 wants to merge 8 commits intoethereum:devfrom jmcook1186:history

+308-6

Commits on Apr 7, 2022

initial commit for updated history page
jmcook1186
committed

Commits on Apr 12, 2022

split content across two pages
jmcook1186
committed

Commits on May 4, 2022

add design rationale page
jmcook1186
committed