refactor: zkquiz setup and testing locally/devnet

[MarcosNicolau]

Changes
This pr refactors zkquiz example so that testing it locally becomes easier.

Testing
To test this, you can follow this guide.

[uri-99]

Also, currently batches must be at least size 2. If you only send this proof, the batch will not be finalized by the batcher. If it is a local devnet example, you could send this proof twice to make the batch finalize, or clarify that the user must in parallel send another proof (such as make batcher_send_risc0_burst)

[entropidelic]

left a small comment on the readme, but aside from that it looks good!

[uri-99]

sending only 1 proof doesn't work

[uri-99]

fixed