chore: Remove unused banner>li style

Author: toshimaru

src/_sass/railsdoc.scss

@@ -143,23 +143,16 @@ code {
 }
 
 .banner {
-  padding-top: 20px;
-
-  h1 {
-    font-size: 1.7em;
-  }
-
-  ul {
-    padding: 0;
-
-    li {
-      list-style: none;
+    padding-top: 20px;
+    
+    h1 {
+        font-size: 1.7em;
+    }
+    
+    .type,
+    .parent {
+        color: $grey;
     }
-  }
-
-  .type, .parent {
-    color: $grey;
-  }
 }
 
 .methods {