Display interactive documentation of babel source

[ianjennings]

From sandboxes created by ianjennings: babel#6

Teach how babel works interactively

• general concepts applicable to other tooling/languages: parser/printer/compiler/AST/tokens/etc (thinking https://regexone.com to learn regex, or same with HTML/CSS/SQL/etc)
• specific things in implementation of babel (aka how to write plugins, many examples of how to do x with examples), use babel-handbook, use code we’ve written in babel plugins or 3rd party ones.

[ianjennings]

I still don't understand what this really means.

[ianjennings]

What I want here are popups around babel specific vocab. Maybe we can do highlighting on the configs to show what the babel properties and values mean.