* chore(rln-relay): make account address optional
* fix(rln-relay): onchain test
* chore(chat2): update docs, and handle error case in chat2
* fix(rln-relay): handle registration better
* initial draft of the tutorial
* WIP: explaining test scenarios
* revises the intro
* sample text output and further instructions and refinement
* renames the prerequisite file
* adds a link to the prerequisite tutorial
* explains how to reuse rln credentials
* adds more revisions on the variable names
* fixes the file name
* revises the intro
* minor rewording
* adds a section header
* makes the waku-rln-relay name consistent in case
* fixes the contract address
* revises the description
* renames client in the sample test
* proof read and spell check
* disambiguates ethereum and goerli accounts
* reorganizes the text
* adds image folder
* adds fig caption and some description
* fixes a wrong case
* removes commented parts
* revises the overview
* more clarification on the spam protection
* addresses editorial comments
* fixes the contract address
* fixes a typo