Update: re-add folderCount to folder-listings

- better differentiates page listings from regular article content
- Changed from `<p>` element to `<h2>` element as folder listing entries are all h3's; better consecutive heading order.
- gave the h2 the class `.foldercount-heading` and styled it like an h3 so it wouldn't detract too much from the page listings

Author: MasssiveJuice08

quartz/components/pages/FolderContent.tsx

@@ -52,11 +52,11 @@ export default ((opts?: Partial<FolderContentOptions>) => {
         <article>{content}</article>
         <div class="page-listing">
           {options.showFolderCount && (
-            <p>
+            <h2 class="foldercount-heading">
               {i18n(cfg.locale).pages.folderContent.itemsUnderFolder({
                 count: allPagesInFolder.length,
               })}
-            </p>
+            </h2>
           )}
           <div>
             <PageList {...listProps} />

quartz/components/styles/listPage.scss

@@ -46,3 +46,10 @@ li.section-li {
     display: none;
   }
 }
+
+// MMW custom styling for folderCount heading
+h2.foldercount-heading {
+  font-size: 1.12rem;
+  margin-top: 1.62rem;
+  margin-bottom: 1rem;
+}