create versionSort function

[katydecorah]

This PR creates a helper function to sort version numbers for the API reference dropdowns

[katydecorah]

@colleenmcginnis

• When creating tests for the helper function, the console insisted that I update the babel versions so that's why you'll see some updates to babel and using the namespaced versions.
• I copied the version-sort.js file and pasted it (temporarily) into the iOS PR so we can test this function. Once we feel good about it, then we can do a release and update the iOS PR

[colleenmcginnis]

@katydecorah I'm getting this error after running npm ci and then npm start 🤔 :

module.js:557
    throw err;
    ^

Error: Cannot find module 'babel-core'
...

[katydecorah]

@colleenmcginnis whoops! I pushed a fix to update babelify to fix that error 🙈

[colleenmcginnis]

@katydecorah this looks amazing!! The tests work as I'd expect, and the temporary commit to /ios-sdk works perfectly. 👌