Issue-1971 & 1972 - docs(get-started)

[marcschaeferger]

Summary Copilot:

This pull request updates the "Get Started" documentation for Vitess across versions 20.0, 21.0, 22.0, and 23.0 to provide a more beginner-friendly quick start guide. The new content focuses on helping evaluators, administrators, and developers easily install, configure, and try Vitess in a test environment before moving to production. The changes also introduce a clear roadmap for progressing from evaluation to production deployment.

The most important changes are:

Content Overhaul & Structure:

• Rewrote the introduction to explain what Vitess is and who the guide is for, targeting evaluators, administrators, and developers.
• Replaced the previous platform-centric deployment instructions with a section outlining multiple lightweight test install options, including local binaries, source builds, and a recommended Docker image.
• Added guidance for using the VSchema demo and iterating on schema/VSchema definitions, including tips for learning sharding and query routing via VTGate.

Testing Instructions:

• Provided clear steps for connecting to VTGate, verifying connectivity, and using the demo web UI to explore schema and query routing.

Roadmap to Production:

• Introduced a step-by-step roadmap for moving from a test setup to a production Vitess cluster, including planning, installation, configuration, data migration, schema evolution, and operational scaling. Role-specific hints for developers, DBAs, and SREs are included.

References:

• Write a "Get Started" introduction #1971
• Write a "What's Next" roadmap #1972
• Umbrella Issue: CNCF Tech Doc Recommendations #1955

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✅ Closes #1971
✅ Closes #1972

[marcschaeferger]

Fixed DCO failing/missing Sign-Off

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[marcschaeferger]

Update to add commit for #1972