Implement minimal MDXE with dark mode and multiple index file support

[devin-ai-integration]

Minimal MDXE Implementation

This PR implements a minimal version of MDXE that loads MD/MDX files from the consuming app's current folder using Next.js App Router with a dynamic catch-all route.

Features

• Dynamic catch-all route (app/[[...path]]/page.tsx) for serving MD/MDX files
• File resolution utilities for finding and processing markdown files
• CLI implementation with dev, build, start, and test commands
• Dark mode support for prose styling
• Support for multiple index file types (README.md(x), page.md(x), index.md(x)) for the root path
• Test script that runs vitest tests but doesn't fail if no tests exist

Implementation Details

• Uses Next.js App Router with a dynamic catch-all route
• Tailwind CSS for styling with dark mode support
• File resolution utilities handle complex path and file type matching
• Persistent dark mode preference using localStorage and system preference detection
• CLI supports serving, building, starting, and testing the application

Link to Devin run

https://app.devin.ai/sessions/1dbc81fa230740b69d3fb6c14e75b673

Requested by: Nathan Clevenger (nateclev@gmail.com)

[devin-ai-integration]

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Name	Status	Preview	Comments	Updated (UTC)
mdx.org.ai	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 20, 2025 0:39am
minimal	❌ Failed (Inspect)			May 20, 2025 0:39am