Update nix build and local dev guides #4945

Job	Run time
Prepare	1m 3s
Build-And-Test-Web	5m 19s
Check-mina-commit	17s
Build-And-Test-Server (Simple integration tests)	17m 1s
Run unit tests parallel (1)	52s
Build-And-Test-Server (Reducer integration tests)	7m 57s
Run unit tests parallel (2)	19m 9s
Build-And-Test-Server (DEX integration tests)	9m 4s
Build-And-Test-Server (DEX integration test with proofs)	9m 36s
Run unit tests parallel (3)	5m 8s
Build-And-Test-Server (Voting integration tests)	3m 59s
Run unit tests parallel (4)	12m 49s
Build-And-Test-Server (Verification Key Regression Check 1)	7m 33s
Run unit tests parallel (5)	17m 12s
Build-And-Test-Server (Verification Key Regression Check 2)	7m 57s
Run unit tests parallel (6)	9m 55s
Build-And-Test-Server (CommonJS test)	1m 30s
Run unit tests parallel (7)	9m 11s
Run unit tests parallel (8)	2m 18s
Build-And-Test-Server (Unit tests)	1s
Release-mina-signer-on-NPM	0s
Release-on-NPM	0s
	2h 27m 51s

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