Feature Request: Marp Syntax Support in Presentation Mode

Hi team, I'd like to request support for Marp (Markdown Presentation Ecosystem) syntax in Outline's presentation mode. What is Marp? Marp is the industry-standard framework for creating presentations from Markdown, supporting: • Slide directives (<!-- _class: lead -->) • Background images () • Themes and custom styling • Export to PDF/PPTX Use Case Our team writes documentation in Outline but currently has to use separate tools (VS Code + Marp extension) for presentations. Native Marp support would allow us to: 1. Create presentation-ready documents directly in Outline 2. Maintain single source of truth for content 3. Export professional slide decks when needed Requested Implementation • Parse Marp frontmatter (--- marp: true) • Support HTML comment directives • Extend image syntax for backgrounds This would make Outline a complete solution for both documentation and presentations. …