Add webkit no scrollbars to navs

pipeline/scss/base/_base.scss

@@ -45,3 +45,7 @@ p {
   margin-bottom: 1.5em;
   line-height: $base-line-height-content;
 }
+
+::-webkit-scrollbar {
+  display:none;
+}

pipeline/scss/layout/_site-navigation.scss

@@ -17,6 +17,9 @@
   display: flex;
   flex-direction: column;
   align-items: center;
+  &::-webkit-scrollbar {
+    display:none;
+  }
   &.navigation-open {
     transition: transform .3s ease-in-out;
     transform: translateX(0px);