v5.8.0

• ⚖️ Updated react-live to the appropriately MIT-licensed v2, thanks to @carlos-kelly!
• 📖 We have officially deprecated spectacle-docs so that the hosted docs are now co-located with the library. Check them out at formidable.com!
• 🧽 Various bug fixes, readme improvements, and infrastructure cleanup to prepare for v6.

Thanks for all of your help, @esthor, @boygirl, and @ryan-roemer.