fix(docs): tidying "Getting started"

[b-long]

• Extract CSS to a file-level <style> block
• Correct the docker ... copy commands, which have been broken for several days (before my recent improvements)

[gemini-code-assist]

Summary of Changes

Hello @b-long, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the clarity and maintainability of the 'Getting Started' documentation. It standardizes the styling of a key download link by abstracting inline CSS into a reusable class and updates command-line instructions to reflect contemporary Docker Compose usage, ensuring the guide remains accurate and easy to follow for new users.

Highlights

• Styling Refactor: Refactored the styling for the 'Download docker-compose.yaml' button by moving inline CSS into a dedicated .download-button class, improving maintainability and consistency.
• Docker Command Update: Updated docker cp commands in the documentation to use the modern docker compose cp syntax, aligning with current Docker Compose CLI practices.

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[gemini-code-assist]

Code Review

The pull request effectively tidies up the "Getting started" documentation. It introduces a CSS class for the download button, replacing inline styles, and updates docker cp commands to the more modern docker compose cp syntax. These changes improve the maintainability and accuracy of the documentation.