No jQuery - Replace with native JavaScript

[ipokkel]

– Replaced JQuery with vanilla JavaScript
– Improved smooth scroll
– Add CSS smooth scroll to CSS on condition that browser settings supports and if reduced motion isn’t true *(https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-behavior#Accessibility_concerns)

• Polyfills set to load conditionally for IE
• Transapiled to ES5 for older browser compatibility
• Convert Nodelists to Arrays for IE compatibility on array.foreach
• html5shiv.js for IE HTML5 support, loads conditionally from CDN
• respond.js for IE 8 media query support, loads conditionally from CDN

[kimcoleman]

This would close issue #56

[sc0ttkclark]

Some initial questions here