Update README, docs, and manifest #8

Job	Run time
Test / x86_64-pc-windows-msvc	49s
Toolchain / stable	18s
Test / x86_64-pc-windows-msvc --release	36s
Toolchain / stable --release	19s
Clippy	20s
Cross / i686-unknown-linux-gnu	1m 12s
Toolchain / beta	15s
Cross / i586-unknown-linux-gnu	1m 26s
Doc	18s
Toolchain / beta --release	15s
Cross / armv7-unknown-linux-gnueabihf	1m 17s
Toolchain / nightly	13s
Features /	31s
Cross / aarch64-unknown-linux-gnu	1m 39s
Toolchain / nightly --release	16s
Features / uuid	17s
Format	21s
Cross / thumbv6m-none-eabi	1m 11s
Features / simdutf8	17s
Miri /	38s
Features / simdutf8 uuid	14s
Miri / --release	35s
Features / std	17s
Features / std uuid	17s
Features / std simdutf8	15s
Features / std simdutf8 uuid	17s
	14m 23s

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