Use the file highlight plugin

Author: DmitrySharabin

_layouts/page.njk

@@ -90,6 +90,7 @@
 	</footer>
 
 	<script src="https://v2.dev.prismjs.com/dist/prism.js"></script>
+	<script src="/dist/plugins/file-highlight.js" type="module"></script>
 	{% if theme_switcher -%}
 	<script src="{{ base_url }}/assets/theme-switcher.js" type="module"></script>
 	{%- endif %}