Create WASI HTTP tutorial

[kate-goldenring]

The book is lacking in a tutorial on using WASI HTTP to create Wasm services and running them with cargo component serve and wasmtime serve etc. Instead of writing and maintaining code, ideally point to existing solutions like this wasi:http Rust sample. We would need to maintain code for JS, C#, C and Python. We could upstream those to be other samples under the BA

Proposed structure:
Tutorial

• Calculator
• WASI HTTP (with code blocks or sub pages)

[vados-cosmonic]

Closing in favor of #182 since I think these are asking for the same thing.

@kate-goldenring (or anyone else who has a closer read), please feel free to re-open if I'm mistaken here!