Switch archive URL code back to href attributes (#17796)

* Add fallback href link
* Switch async archive generation to use href links
* Edit all templates to use href instead of data-url for archives
* Add consistent rel="nofollow" as per wxiaoguang

web_src/js/features/repo-common.js

@@ -35,7 +35,7 @@ function getArchive($target, url, first) {
 export function initRepoArchiveLinks() {
   $('.archive-link').on('click', function (event) {
     event.preventDefault();
-    const url = $(this).data('url');
+    const url = $(this).attr('href');
     if (!url) return;
     getArchive($(event.target), url, true);
   });