v0.3.2

Added

• ApiDoc.to_markdown() method to export API documentation as a Markdown string for use in READMEs.
• ApiDoc signature block now has Python syntax highlighting, matching code blocks in docstrings.

Changed

• Moved example notebooks from examples/ to demos/ folder.
• Added infinite zoom (Droste effect) example to the docs gallery.
• Paint toolbar icons: replaced generic pencil icons with a distinct pen (brush) and highlighter (marker) to make the tools easier to tell apart.