jQuery already sports 'addClass', 'removeClass', etc. features from 'classies.js`

[peterblazejewicz]

jQuery is already root dependency for website, so entire classie.js custom client code taken from 3rd party page seems to be not needed:
$.addClass
$.hasClass
$.removeClass
$.toggleClass
classie.js
https://github.com/OmniSharp/OmniSharp.github.io/blob/master/_includes/js.html#L2-L9

If the entire purpose of classie.js is to support other 3rd party script cbpAnimatedHeader.js used to animate top header:
https://github.com/OmniSharp/OmniSharp.github.io/blob/master/js/cbpAnimatedHeader.js
the code could be just rewritten, correctly referencing source of original code in banner.

Let me know what you think as I could do PR rewriting cbpAnimatedHeader.js to custom animate-header.js and removing 3rd party dependency (while retaining banner reference for feature idea)

The page would gain cleaner source code and will be slightly lighter (so will be loading faster).

Thanks!

Edit: I figured out that these JS codes come with freelancer 3rd party template.