06b7e0df64
Add content type handling and multi-page generation: - content.rs: Add ContentKind enum (Post, Page, Section, Project) and extend Frontmatter with weight/link_to fields - templates.rs: Add render_page, render_homepage, render_blog_index, render_projects_index templates - main.rs: Process all content types with dedicated handlers Output structure: - /index.html (homepage from _index.md) - /blog/index.html (post listing, sorted by date) - /blog/<slug>/index.html (individual posts) - /about/index.html, /collab/index.html (standalone pages) - /projects/index.html (project cards with external links)