Revert "FIX : [scss] 형광펜 밑줄 효과 임시 제거"

This reverts commit 68a1cbf.

Author: dev-splin

assets/css/jekyll-theme-chirpy.scss

@@ -12,7 +12,7 @@
 }
 
 /* append your custom style below */
-// .highlighting-underline {
-//   background: linear-gradient(transparent 60%, #1b99f3 80%);
-//   padding: 2px 4px;
-// }
+.highlighting-underline {
+  background: linear-gradient(transparent 60%, #1b99f3 80%);
+  padding: 2px 4px;
+}