remove header font-weight

src/client/styles/scss/_layout.scss

@@ -10,15 +10,6 @@
   padding-top: 10px !important;
 }
 
-h1,
-h2,
-h3,
-h4,
-h5,
-h6 {
-  font-weight: 500;
-}
-
 .logo {
   .logo-mark {
     svg {