chore(docs): Update web app page to use nargo v 0.31 #10419

Job	Run time
build-nargo	2m 33s
build-acvm-js	1m 17s
build-noirc-abi	1m 28s
build-noir-wasm	3m 49s
ACVM JS (Node.js)	41s
ACVM JS (Browser)	1m 10s
noirc_abi	1m 8s
Noir JS	1m 18s
Example scripts	11s
Check external repo - zac-williamson/noir-edwards	8s
noir_codegen	1m 24s
Integration Tests (Node)	2m 8s
Integration Tests (Browser)	1m 49s
noir_wasm	2m 6s
End	1s
	21m 11s

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