Fix PagedJS distribution CDN

Closes #321

Author: palemieux

scripts/build.mjs

@@ -509,7 +509,7 @@ async function makePDF(docPath, pdfPath) {
     window.PagedConfig = window.PagedConfig || {};
     window.PagedConfig.auto = false;
   });
-  await page.addScriptTag({ url: 'https://unpkg.com/pagedjs/dist/paged.polyfill.js' });
+  await page.addScriptTag({ url: 'https://cdn.jsdelivr.net/npm/pagedjs@0.4.3/dist/paged.polyfill.js' });
 
   let renderingDone;
   let rendered = new Promise(function (resolve, reject) {

smpte.js

@@ -1370,7 +1370,7 @@ async function render() {
   /* debug print version */
   if (docMetadata.media === "print") {
     let pagedJS = document.createElement("script");
-    pagedJS.setAttribute("src", "https://unpkg.com/pagedjs/dist/paged.polyfill.js");
+    pagedJS.setAttribute("src", "https://cdn.jsdelivr.net/npm/pagedjs@0.4.3/dist/paged.polyfill.js");
     pagedJS.id = "paged-js-script";
     document.head.appendChild(pagedJS);
   }