[output] Include interactive babel handbook

[ianjennings]

Redo the handbook, make it interactive (https://github.com/jamiebuilds/babel-handbook/blob/master/translations/en/plugin-handbook.md)

• This is just a copy paste https://github.com/babel/website/pull/1726, I’d like to see https://regexone.com/ type idea add examples of code: https://github.com/babel/website/pull/1220
• I’d like to be able to click on some buttons/dropdown of examples of various syntax

[ianjennings]

Related to #6

[ianjennings]

Kamino closed and cloned this issue to MLH-Fellowship/babel-sandbox