Try doing a wee cleanup

src/layouts/partials/remark42.html

@@ -0,0 +1,16 @@
+<hr>
+<blockquote>
+  <p> Comments are in the beta testing stage. </p>
+</blockquote>
+<div id="remark42"></div>
+
+<script>
+  var theme = "light"
+  if (document.body.classList.contains("dark")) theme = "dark";
+  var remark_config = {
+    host: "{{ site.Params.Remark42URL }}",
+    site_id: "{{ site.Params.Remark42ID }}",
+    theme: theme
+  }
+</script>
+<script>!function(e,n){for(var o=0;o<e.length;o++){var r=n.createElement("script"),c=".js",d=n.head||n.body;"noModule"in r?(r.type="module",c=".mjs"):r.async=!0,r.defer=!0,r.src=remark_config.host+"/web/"+e[o]+c,d.appendChild(r)}}(remark_config.components||["embed"],document);</script>