Enhance homepage and navigation

[mintlify]

Improved homepage with stronger CTAs, feature comparison table, learning hub, and reorganized navigation inspired by Anthropic's documentation structure. Added new resource pages for better discoverability and user guidance.

Files changed:

• index.mdx - Enhanced homepage with CTAs and "Explore Mintlify" section
• features/comparison.mdx - New feature comparison table
• features/capabilities.mdx - New platform capabilities showcase
• resources/learning-hub.mdx - New comprehensive learning hub
• resources/whats-new.mdx - New what's new highlights page
• resources/support.mdx - New centralized support resources page
• docs.json - Updated navigation with new Resources group

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Note

Introduces new pages and improves discoverability across the docs.

• Adds features/capabilities and features/comparison to showcase platform features and plan differences
• Creates resources/learning-hub, resources/whats-new, and resources/support for tutorials, updates, and help
• Enhances index.mdx with primary/secondary CTAs and an "Explore Mintlify" section linking to new pages
• Updates docs.json navigation: includes new features in "Get started" and adds a new "Resources" group with links to learning hub, what's new, changelog, and support

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