Fix: change CSS comment style (planning#404)

src/css/style.scss

@@ -61,14 +61,14 @@ img {
   top: -70px;
 }
 
-// import css-vars directly from mosaic theme
+/* import css-vars directly from mosaic theme */
 @import '~@stoplight/mosaic/themes/default.css';
 .json-schema-viewer {
-  // load via meta-load in wrapper class, to prevent css leaking to rest of the site
+  /* load via meta-load in wrapper class, to prevent css leaking to rest of the site */
   @include meta.load-css('../../node_modules/@stoplight/mosaic/styles.css');
 }
 
-// custom navbar back-to-root link
+/* custom navbar back-to-root link */
 .navbar__items {
   position: relative;
 }