feat: what is a node

[delovoyhomie]

Closes #1683

[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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Reviewing files that changed from the base of the PR and between 0f17e04 and 9eec9bd.

⛔ Files ignored due to path filters (1)

• resources/images/nodes/node-flow.svg is excluded by !**/*.svg

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• docs.json
• what-is-a-node.mdx

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