feat(docs): Documenting noir codegen #5398

Job	Run time
build-nargo	6m 9s
build-noirc-abi	2m 36s
build-acvm-js	3m 2s
build-noir-wasm	4m 59s
noirc_abi	45s
noir-js-backend-barretenberg	43s
ACVM JS (Node.js)	34s
ACVM JS (Browser)	1m 19s
noir_wasm	1m 10s
Integration Tests (Node)	3m 51s
Noir JS	1m 25s
noir_codegen	56s
Integration Tests (Browser)	5m 14s
End	1s
	32m 44s

Provide feedback