docs: Modify Hello world tutorial

[toschdev]

The Hello World tutorial was explaining way too many details to be a "short entry" into building your first blockchain.

This PR aims to make it very easy to follow and really quick to go through, for developers to see how easy it is to get their first chain running.

[github-actions]

Visit the preview URL for this PR (updated for commit 2cca263):

https://igntservices-docs--pr3768-docs-hello-world-47u6csdw.web.app

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[salmad3]

Thanks @toschdev, real clean! I left some suggestions.
Tested e2e and lgtm.

I also believe the extra context provided in the original tutorial are beneficial for individuals seeking a deeper understanding of each component. To accommodate this, we could consider integrating a condensed version of these explanations as dropdown menu(s) for those seeking further information, in a way where it doesn't overwhelm the tutorial itself. We could also present brief notes as markdown comments for straightforward reference instead of drop downs, or a combination of both.

If not, I'd advocate for a reference existing somewhere, and then in a single statement, we can point to the reference by stating something like "if you're interested in more details about xyz, go here." This probably works best for the "hello world" tutorial.

addressed