feat: hide TOC when no headers (closes #204)

content/_index.md

@@ -1,5 +1,6 @@
 ---
-title: 🪴 Quartz 3.3
+title: 🪴 Quartz 3.
+enableToc: false
 ---
 
 Host your second brain and [digital garden](https://jzhao.xyz/posts/networked-thought) for free. Quartz features

layouts/partials/toc.html

@@ -1,4 +1,5 @@
-{{ if (and $.Site.Data.config.enableToc (ne .Params.enableToc false) (gt .WordCount 250)) }}
+{{ $hasHeaders := gt (len (findRE "<h\\d.*?>(.|\n)*?</h\\d>" .Content)) 0 }}
+{{ if (and $.Site.Data.config.enableToc (ne .Params.enableToc false) $hasHeaders) }}
 <aside class="mainTOC">
     <details {{ if $.Site.Data.config.openToc }}open {{ end }}>
         <summary>{{ i18n "toc" }}</summary>