Update nix build and local dev guides #4992

Job	Run time
Prepare	57s
Build-And-Test-Web	5m 3s
Check-mina-commit	10s
Run unit tests parallel (1)	50s
Run unit tests parallel (2)	19m 26s
Build-And-Test-Server (Simple integration tests)	23m 43s
Run unit tests parallel (3)	4m 59s
Build-And-Test-Server (Reducer integration tests)	8m 1s
Run unit tests parallel (4)	13m 40s
Build-And-Test-Server (DEX integration tests)	9m 2s
Run unit tests parallel (5)	17m 51s
Build-And-Test-Server (DEX integration test with proofs)	9m 44s
Run unit tests parallel (6)	10m 12s
Build-And-Test-Server (Voting integration tests)	3m 54s
Run unit tests parallel (7)	8m 48s
Build-And-Test-Server (Verification Key Regression Check 1)	7m 43s
Run unit tests parallel (8)	2m 15s
Build-And-Test-Server (Verification Key Regression Check 2)	8m 4s
Build-And-Test-Server (CommonJS test)	1m 34s
Build-And-Test-Server (Unit tests)	1s
Release-on-NPM	0s
Release-mina-signer-on-NPM	0s
	2h 35m 57s

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