Release 0.2.0

Added

• Implemented Twitter emojis (Twemoji)
• Added collapsible callouts for screenshots and images
• Made headings collapsible
• Added heading link anchors on hover
• Added automatic table of contents menu
• Added titles for image and screenshot callouts

Changed

• Moved extra Markdown processing from client-side JavaScript to Rust build script
• Various styling tweaks

Removed

• Removed use of hardlinks from build script