docs: update changelog, architecture, contributing #448

Job	Run time
Build wasm	2m 50s
Run tests on Linux x86 (stable, no default features)	40s
Run tests on Linux x86 (nightly, no default features)	1m 11s
Run tests on Linux x86 (stable)	40s
Run tests on Linux x86 (nightly)	1m 7s
Run tests on macOS arm64 (Apple M1)	57s
Run tests on Linux armv7	2m 54s
Run tests on Linux arm64	2m 56s
	13m 15s

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