Babel.io website doesn't work in IE11

## Bug Report
Home page, demo of code load error in IE
https://babeljs.io/
Object doesn't support property or method 'transform'

Also https://babeljs.io/repl
Never loads.

- [ ] I would like to work on a fix!

**Current behavior**
IE11 on https://babeljs.io/
Object doesn't support property or method 'transform'

`qi=Symbol.for("var used to be block scoped")`
'Symbol' is undefined

IE11 on https://babeljs.io/repl
Never loads.

**Input Code**
https://babeljs.io/

**Expected behavior**
No errors and page should load

**Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)**
https://babeljs.io/

**Environment**
https://babeljs.io/

**Possible Solution**

**Additional context**