add $font-weight-bold

src/client/styles/scss/_override-bootstrap-variables.scss

@@ -39,6 +39,8 @@ $line-height-base: 1.42857;
 $text-muted: $gray-500;
 $blockquote-small-color: $gray-500;
 
+$font-weight-bold: bold;
+
 //== Components
 //
 $border-radius:               .15rem;