remove unused css

apps/app/src/styles/organisms/_wiki.scss

@@ -108,14 +108,6 @@
   }
   /* stylelint-enable no-descending-specificity */
 
-  h1,
-  h2,
-  h3,
-  h4,
-  h5,
-  h6 {
-  }
-
   p {
     margin: 15px 0;
     font-weight: normal;