v5.3.0

Various bug fixes, plus exciting stuff like:

• Export your slides with your notes!
• Use new state and onStateChange props to gain further control over the css in your presentation
• TypeScript definitions are updated and ship with the library!

We've also updated the documentation pretty heavily and added a new Getting Started tutorial!

Thanks a bunch to @rawrmonstar and @kale-stew, they both did a ton of work that's featured in this release.