feat: add markdown content pipeline with build script

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

content/blog/en/2026-03-25-introducing-texpixel.md

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+---
+title: Introducing TexPixel
+description: Meet TexPixel — your AI-powered formula recognition tool
+slug: introducing-texpixel
+date: 2026-03-25
+tags: [announcement, product]
+---
+
+# Introducing TexPixel
+
+We're excited to announce TexPixel, an AI-powered tool for converting math formulas from images into editable formats.
+
+## Why TexPixel?
+
+Converting handwritten or printed math formulas into digital formats has always been a tedious process. TexPixel makes it effortless — just upload an image and get LaTeX, MathML, or Markdown output in seconds.
+
+## Key Features
+
+- **High accuracy** — Powered by advanced AI models
+- **Multiple output formats** — LaTeX, MathML, Markdown, Word
+- **Easy to use** — No installation required, works in your browser
+- **Free to start** — 3 free uploads per day, no credit card needed
+
+## What's Next
+
+We're working on exciting new features including batch processing, API access, and more. Stay tuned!