One deck, three formats

Every slide is a file in src/content/decks/<deck>/, sorted by name:

File	Format	Good for
03-formats.mdx	MDX	Markdown + components (this slide)
04-markdown.md	Markdown	Plain content, code, diagrams
05-html.html	HTML	Hand-crafted or AI-generated markup

Frontmatter works the same in all three — try the next two slides.