0.1.1: Merge pull request #1 from cellog/fix-all-things

• migrate revealjs-react to typescript
• publish as @gregcello/revealjs-react
• massive refactor the internals
• fix bug in the way className is calculated (it used to add the class undefined with the old logic)
• DRY up all the simple components that are the same except for their HTML tag name
• add onDeckReady callback to the RevealJS component
• add useReveal hook for internal custom components
• add strong typing to Reveal.js internally, and make them available
• bundle plugins as direct exports of the package, instead of requiring relative path import weirdness.