Docs: switch to well-maintained jsdoc2md for JSDoc parsing

docs/index.html

@@ -77,9 +77,7 @@
             .map(function (sidebarLink) {
               return sidebarLink.title;
             })[0];
-          return title
-            ? md.replace(/<!-- Generated by documentation.js. Update this documentation by updating the source code. -->/, '# ' + title)
-            : md;
+          return title ? `# ${title}\n${md}` : md;
         });
       }
     };