docs: expand About section with website architecture details

[franzonia137]

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Description

This PR expands the About section of the README to provide more context about the Beam website architecture, tooling, and documentation structure.

Changes

• Added details about Hugo, Docsy, and Bootstrap usage
• Clarified how and where API documentation is generated and stored
• Documentation-only change, no functional impact

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[gemini-code-assist]

Summary of Changes

Hello @franzonia137, 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 significantly enhances the "About" section within the website/README.md file, providing a more detailed and informative overview of the Apache Beam website's architecture. The update clarifies the roles of key technologies such as Hugo, Docsy, and Bootstrap, and explains the structure of content and the separate management of API documentation. This improvement aims to offer better context for contributors and users interested in understanding the website's technical foundation, without introducing any functional changes.

Highlights

• Website Architecture Details: The "About" section in website/README.md has been expanded to include more comprehensive details about the website's architecture.
• Tooling Clarification: Specific tools like Hugo, Docsy, and Bootstrap are now described with more context regarding their roles in site generation, theming, and responsive design.
• API Documentation Process: The documentation clarifies how API documentation (Javadoc, Pydoc) is generated, stored, and maintained separately in the beam-site repository to ensure versioning and consistency.
• No Functional Impact: This change is purely documentation-based and introduces no functional changes to the website or codebase.

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R: @kennknowles for label website.

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