feat: docs landing page with a playground #475

Job	Run time
build-acvm-js	3m 18s
build-nargo	2m 12s
build-noirc-abi	3m 31s
build-noir-wasm	5m 8s
source-resolver	1m 54s
ACVM JS (Node.js)	25s
ACVM JS (Browser)	54s
noirc_abi	1m 5s
noir_codegen	41s
noir-js-backend-barretenberg	26s
Noir JS	1m 15s
noir_wasm	46s
Integration Tests	8m 30s
End	1s
	30m 6s

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