refactor: remove predefined callout/box styles, let model generate its own

fix: use ./ for marketplace plugin source path

fix: update repo URL to match GitHub rename

feat: add plugin marketplace support for distribution

fix: preserve slide position after saving in editor

fix: improve editor UX with escape-to-deselect, toast notifications, and flicker-free save

feat: add browser-based text editor for presentations

docs: add css theme to readme

docs: move examples + add readme

docs: add example presentations

fix: viewport color + chart export settings

fix: remove mostly unused reveal.js base themes

chore: repo cleanup

updated skill mirroring anthropic's + repo cleanup

feat: initial skill, examples, and scraped reveal.js docs