Fix SASS syntax for GitHub Pages compatibility

Replace math.div() with standard division operator for compatibility with GitHub Pages sassc version.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dvXcode

_sass/libraries/hamburgers/_base.scss

@@ -57,7 +57,7 @@
 .hamburger-inner {
   display: block;
   top: 50%;
-  margin-top: math.div($hamburger-layer-height, -2);
+  margin-top: ($hamburger-layer-height / -2);
 
   &,
   &::before,

_sass/libraries/hamburgers/types/_slider.scss

@@ -27,7 +27,7 @@
         transform: translate3d(0, $y-offset, 0) rotate(45deg);
 
         &::before {
-          transform: rotate(-45deg) translate3d(math.div($hamburger-layer-width, -7), $hamburger-layer-spacing * -1, 0);
+          transform: rotate(-45deg) translate3d(($hamburger-layer-width / -7), $hamburger-layer-spacing * -1, 0);
           opacity: 0;
         }