Revert "Upload old System"

This reverts commit 13af30f74b

scss/utils/_mixins.scss

@@ -1,25 +0,0 @@
-@mixin element-invisible {
-  position: absolute;
-
-  width: 1px;
-  height: 1px;
-  margin: -1px;
-  border: 0;
-  padding: 0;
-
-  clip: rect(0 0 0 0);
-  overflow: hidden;
-}
-
-@mixin hide {
-  display: none;
-}
-
-// Update the mixin to accept 3 arguments: direction, wrap, and justify
-@mixin flexbox($direction, $wrap: nowrap, $justify: flex-start, $align: stretch) {
-  display: flex;
-  flex-direction: $direction;
-  flex-wrap: $wrap;
-  justify-content: $justify;
-  align-items: $align;
-}