feat(milestone): add all milestone pages; some other minor edits

Author: timmywil

_data/metadata.js

@@ -2,7 +2,7 @@ module.exports = {
   title: 'jQuery - Bug Tracker',
   url: 'https://bugs.jquery.com/',
   language: 'en',
-  description: 'Static archive of the old bugs.jquery.com trac site.',
+  description: 'Static archive of the old bugs.jquery.com Trac site.',
   author: {
     name: 'Timmy Willison',
     email: 'timmywil@users.noreply.github.com',