remark: remove dark theme

layouts/partials/footer_custom.html

@@ -10,10 +10,6 @@
     theme: 'light'
   };
 
-  if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
-      remark_config.theme = "dark";
-  }
-
   (function(c) {
     for(var i = 0; i < c.length; i++){
       var d = document, s = d.createElement('script');
@@ -22,11 +18,6 @@
       (d.head || d.body).appendChild(s);
     }
   })(remark_config.components || ['embed']);
-
-  window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', event => {
-    const newColorScheme = event.matches ? "dark" : "light";
-    window.REMARK42.changeTheme(newColorScheme);
-  });
 </script>
 {{ end }}
 {{ end }}