docs: replace museum api card with cafe api card

[Daryna-del]

What/Why/How?

Replace Museum API with Cafe API on /docs page

Reference

Testing

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Check yourself

• Code is linted
• Tested
• All new/updated code is covered with tests

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

[redocly]

marketing-site AI Review: 🟢 Completed

Reunite Agent has reviewed your changes and found 2 potential issue(s).

Note

Low Risk

This PR only modifies documentation content on the docs index page and introduces a new SVG asset. It does not alter any system behavior, code, or operational infrastructure.

Overview

Replaces the "Museum API example" card with the "Cafe API example" card on the docs home page (docs/index.md). Updates the link to point to the cafe-api repository and adds a new coffee.svg icon to be used for the card.