feat: We need to update our readme here to provide better documentation

[0xJepsen]

For example, we should mention where the manifests come from and what is being proved in the example.

We should also mention that they need to install the mobile app to generate the proof.

[0xFloyd]

crossposting from web-prover

"We are running into developers in the tg that are trying to set up the web prover, which they do not need to do unless self hosting or building a custom app/extension. We need to explain clearly that the default is self hosted and you dont need to run it unless youre doing a custom example"