readme: `Documentation` -> `Books` & `Crates` #2430

Job	Run time
typo	7s
fmt	5s
ci (windows-latest)	1h 6m 38s
wasm-32-bit-support (cuprate-epee-encoding)	32s
ci (macos-latest)	31m 10s
wasm-32-bit-support (cuprate-rpc-types)	1m 14s
ci (ubuntu-latest)	34m 1s
wasm-32-bit-support (cuprate-fixed-bytes)	29s
	2h 14m 16s

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