feat(dashboard): code block syntax highlighting

dashboard/styles/themes.scss

@@ -2,6 +2,7 @@ $primary: #da9317;
 $primary-alt: #da9317;
 @import "generic.scss";
 @import "bootstrap/scss/bootstrap.scss";
+@import 'highlight.scss';
 
 // dark mode. dark.scss extends nightshade
 @import "bootstrap-nightshade.scss";