content: Replace calls to the code shortcode with fenced code blocks

layouts/shortcodes/code-toggle.html

@@ -72,7 +72,7 @@ Renders syntax-highlighted configuration data in JSON, TOML, and YAML formats.
 <div x-data class="shortcode-code not-prose relative p-0 mt-6 mb-8">
   {{- if $copy }}
     <svg
-      class="absolute right-3 top-12 z-30 text-blue-600 hover:text-blue-500 cursor-pointer w-6 h-6"
+      class="absolute right-4 top-12 z-30 text-blue-600 hover:text-blue-500 cursor-pointer w-6 h-6"
       @click="$copy($refs[$store.nav.userSettings.settings.configFileType])">
       <use href="#icon--copy"></use>
     </svg>