Make "Hello world" walkthrough more structured

[mikhail-turilin-dfinity]

I find "Hello world" walkthrough navigation a bit intimidating - there's too much information there. Do we have any other ways to structure a step-by-step guide?

The gold standard here would be Stripe which has tutorials where the steps are linked to the code. However, it's probably hard to implement.

Plaid API is probably closer to what we can create in a short term. It's nicely laid out, not intimidating, and easy to follow:

[jessiemongeon1]

Hello, World has recently been updated and simplified: https://internetcomputer.org/docs/current/developer-docs/getting-started/hello-world