[WIP] Aggregate external blog posts and display on homepage and posts page

[Copilot]

• Explored repository structure and Hugo configuration
• Understood current post rendering system using Toha theme
• Tested Hugo's getJSON capabilities (found limitations)
• Create RSS feed aggregation script
• Create data structure for external posts
• Modify recent posts section to include external content
• Modify posts list page to include external content
• Create external post card template
• Update build process to fetch feeds automatically
• Test aggregation with three target blogs
• Add deduplication logic
• Add external source indicators
• Validate UI consistency and functionality

Plan: Create a Node.js script to fetch RSS feeds during build time and store results in Hugo data files. Then modify templates to display both internal posts and external aggregated content seamlessly.

Fixes #15.

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