Add unescape param to code shortcode

layouts/shortcodes/paige/code.html

@@ -1,9 +1,14 @@
 {{ $content := .InnerDeindent | strings.TrimLeft "\f\n\r\v" | strings.TrimRight "\f\n\r\t\v " }}
 {{ $lang := .Get 0 | default (.Get "lang") | default "plaintext" }}
 {{ $options := .Get "options" }}
+{{ $unescape := .Get "unescape" }}
 
 {{ if not $content }}
     {{ errorf "layouts/shortcodes/paige/code.html: no content" }}
 {{ end }}
 
+{{ if $unescape }}
+    {{ $content = htmlUnescape $content }}
+{{ end }}
+
 <div class="paige-code">{{ highlight $content $lang $options }}</div>