refactor: update layout

Author: mrholek

src/pug/_layout/default.pug

@@ -14,7 +14,7 @@ html(lang='en')
     block styles
   body
     include ../_partials/sidebar.pug
-    .wrapper.d-flex.flex-column.min-vh-100.bg-body-tertiary
+    .wrapper.d-flex.flex-column.min-vh-100
       include ../_partials/header.pug
       .body.flex-grow-1.px-3
         .container-lg