Simplify local setup

[kronosapiens]

We should make it as easy as possible for a user to clone the repo and get up-and-running locally, with as few commands and as little configuration as possible. This may mean hard-coding sensible defaults for local Katana and Torii development.

[kronosapiens]

With this commit users will automatically connect to the Sepolia deployment of the starter, allowing them to immediately begin interacting with the game.

[coxmars]

let me work