Rewrites docs/README.md from scratch for issue 672. Every statement was
checked against the code on next. The two false statements of the old
guide are gone: history rows show the other party's address in full
(the only shortened address is the label of a token with no known
symbol), and the balance list hides a token that claims ETH from the
wrong contract. Each technical word is defined in a short clause where
it first appears: block, receipt, network fee, gas, swap, token
approval, Permit, Permit2, Uniswap, contract, origin, host name, port,
nonce, hash, node.
Model: fable-5-1
sneak