Code Refactoring & Bug Fixes

This release...

• Switched to using Yarn as the package manager
• Moved the Logootish algorithm into its own package built with webpack
• Started unit testing the Logootish algorithm
• Slightly tweaked the UI
• Cleaned up some code
• Started using loglevel for debug logs
• Fixed two editing bugs
  • One caused out-of-order nodes in rare cases
  • One would make it impossible to insert text
  • Hopefully this is the last time

EDIT: Fixed a build issue that caused all the CSS to disappear in production builds