Katana `v0.6.0` docs

[kariy]

added/updated docs for :

Checklist

• [x] Messaging
• [x] Forking
• [x] Storage
• [x] Execution engine
• [x] starknet RPC
• [x] torii RPC
• [x] katana RPC
• [x] dev RPC
• [x] Genesis config
• [x] CLI

I've moved the docs for these features to their own page to avoid convoluting the Reference page. Generally, I think it's better to have them in separate page to keep the docs cleaner and makes it easier to add more stuff on each section.

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[kariy]

@ponderingdemocritus pls review ser

[ponderingdemocritus]

juicy