Create Landing Page with Clear Conversion Path

[patdhlk]

Description

Redesign the documentation landing page (index.rst) to create a clear journey from "getting started" to "enterprise inquiry."

Acceptance Criteria

• Restructure docs/index.rst with:
  • Clear value proposition headline
  • "Get Started in 5 Minutes" quick path
  • Visual journey: Learn → Try → Scale → Enterprise
  • Prominent links to enterprise products
• Add "Who is this for?" section with personas:
  • Individual developer (free tools)
  • Small team (Sphinx-Needs + basic setup)
  • Enterprise (ubCode, ubTrace, ubConnect)
• Include customer logos or testimonials if available
• Add "Book a Demo" or "Contact Sales" CTA for enterprise