Add starknet devnet rs docs

[dalmasonto]

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[omarespejel]

Hey @dalmasonto, I am closing this PR since its content is already visible in the one updating sncast which was already merged. Thanks!

[dalmasonto]

Hi @omarespejel, so since the content looked similar, this branch had some updated information about devnet rs. Maybe if you allow I will have to create a different PR with the new content. The content merged with the 'sncast script' PR is not much updated with the right documentation of devnet rs.

I have checked it out on the main branch and this is part of what I have for that part

I have thsi options part since the part that you have merged has options that are not correct that is devnet python options since I had passed a link to those.

Thanks