feat: what is a node

[delovoyhomie]

Closes #1683

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[delovoyhomie]

/review

[github-actions]

Thanks for the clear new overview in what-is-a-node.mdx: I’ve left several suggestions there, so please apply the inline suggestions to align the wording and structure with the style guide.

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[novusnota]

This page should probably become a part of start-here and nodes/overview, with the latter taking most of it. An alternative place might be in onboarding/nodes, which reminds me of https://solana.com/learn — the page on nodes won't be that efficient nor useful on its own, but together with others it might work out. However, start-here seems to be doing well concept-wise, what we're lacking is more tutorials strengthening the concepts with practical-ish examples right out of the gate.

(mostly notes to self)