disable css transaction for _menu, add preload headers

Author: Falaleev Maxim

netlify.toml

@@ -1,2 +1,9 @@
 [context.production.environment]
   HUGO_VERSION = "0.32"
+
+[[headers]]
+  for = "/*"
+  [headers.values]
+    Link = '''
+    </build/css/app.css>; rel=preload; as=stylesheet, \
+    </build/js/app.js>; rel=preload; as=stylesheet'''

themes/hugo-simple-doc/assets/src/css/block/_menu.scss

@@ -16,7 +16,7 @@
 
   &__link {
     font-size: 0.95em;
-    transition: all 0.25s ease;
+    transition: background-color 0.25s ease;
     text-decoration: none;
     color: #32536a;
     display: block;