Upgrade pagedjs to 0.5.0

There is only a 0.5.0-beta.2 version available currently, see https://www.npmjs.com/package/pagedjs?activeTab=versions . Fortunately, there are signs that we'll have a 0.5.0 version https://pagedjs.org/posts/en/kickstarting-the-next-iteration-of-paged.js/ . We hope the new version to fix the rendering of tables with cells that span multiple rows / columns.