adapt docs/scripts to new smart contract definition

[Ivansete-status]

Description

We will move to a new RLN smart contract implementation.
Therefore, we might need to adapt the docs and scripts in nwaku-compose to make them aligned to the upcoming new RLN management.

[Ivansete-status]

@stubbsta - we think that some work was already done with regards to scripts and docs so maybe this issue is duplicated
Thanks!

[Ivansete-status]

This issue is somehow duplicated by the following

• chore: RLN contract is outdated in the documentation nwaku#3416