Updates sass-loader to v16. Updates favicon. Minor demo page styling changes.

Author: pnikolov

package-lock.json

@@ -49,7 +49,7 @@
     "postcss-loader": "^8.1.0",
     "prettier": "^3.7.4",
     "sass": "^1.50.1",
-    "sass-loader": "^14.1.0",
+    "sass-loader": "^16.0.6",
     "stylelint": "^16.26.1",
     "stylelint-config-standard-scss": "^16.0.0",
     "stylelint-scss": "^6.14.0",

package.json

@@ -131,7 +131,7 @@ blockquote {
   background: vars.$light-gray;
   border-left: 4px solid vars.$link-color;
   border-radius: 5px;
-  margin: 10px 0;
+  margin: 10px 30px;
   padding: 10px 10px 10px 20px;
 }