Improve Writings pagination system

[gkoscky]

The pagination system in Writings currently has a number of issues:

1. Not knowing the page you're on
2. Not being able to skip pages (like go straight to page 3)
3. Browser history not updating when you move pages, so the back/forward buttons break
4. You can't link to a specific page

Look into revamping how it works to address at least the issues above