Backwards compatible Styles & JS

[codedbyglenden]

Discussed in #6

^{Originally posted by TheOneAndOnlyZulu March 8, 2022}
We want to use the latest & greatest in the world of JS & css, but we should also think of the poor souls that need to support IE 🤮

• One set of css/js files for modern browsers that will only work on the latest patch of all browsers
• One set of css/js files for elderly browsers IE 11 (I refuse to support anything earlier than IE11).