Update division syntax in example project

Author: nerdpruitt

example-project/scss/config/_base-font.scss

@@ -1,3 +1,5 @@
+@use 'sass:math';
+
 // Base Font
 // ---------------------------------------------------------
 //
@@ -7,4 +9,4 @@
 // ---------------------------------------------------------
 
 $base-font-size: 16;
-$base-line-height: 24 / $base-font-size;
+$base-line-height: math.div(24, $base-font-size);