data-ize various page content calls

* page.cover replaces calls to generateCoverLink
* page.main.headingMode replaces calls to
  generateStickyHeadingContainer or html.tag('h1')
* page.main.classes: ['long-content'] replaces hard-
  coded calls to html.tag('div', {class: 'long-content'})

1 files changed, 1 insertions, 1 deletions

diff --git a/src/upd8.js b/src/upd8.js
index 21413a17..5d507407 100755
--- a/src/upd8.js
+++ b/src/upd8.js
@@ -79,7 +79,7 @@ import FileSizePreloader from './file-size-preloader.js';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
-const CACHEBUST = 17;
+const CACHEBUST = 18;
 
 let COMMIT;
 try {