move styles and js to the root directory

styles/elements/_icons.scss

@@ -0,0 +1,52 @@
+@mixin icon {
+  display: inline-flex;
+
+  > svg {
+    width: 100%;
+    height: 100%;
+    * {
+      transition: fill $hover-transition-time;
+    }
+  }
+}
+
+@mixin icon-size($size) {
+  $icon-size: $size * .1rem;
+  width: $icon-size;
+  height: auto;
+  margin: $icon-size / 4;
+}
+
+@mixin icon-color($color) {
+  > svg * {
+    fill: $color;
+  }
+}
+
+@mixin icon-style-default {
+  @include icon-color($color-black);
+}
+
+@mixin icon-style-active {
+  @include icon-color($color-primary);
+}
+
+@mixin icon-style-inverted {
+  > svg * {
+    fill: $color-white;
+  }
+}
+
+.icon {
+  @include icon;
+  @include icon-size(16);
+  @include icon-style-default;
+
+  &.icon--tiny {
+    @include icon-size(10);
+  }
+
+  &.icon--large {
+    @include icon-size(24);
+  }
+}