The deploy command in the docs is not correct

## Description

Current deploy command in the docs: `yarn deploy --semaphore <semaphore-address> --group <group-id> --network sepolia`

Issue:

The --group flag is no longer required since Semaphore V4.

Suggested fix:

Update the command to: `yarn deploy --semaphore <semaphore-address> --network sepolia`

## Context

Thank you very much Mitsu for reporting this issue.