Pagination of solutions (and likely other things) doesn't move focus when page changes

[SleeplessByte]

Linking Accessible Pagination. Note that basically everything from that document has been implemented. A few comments of what's currently implemented and what I expected.

• Pagination is using button but those buttons are without type. This is fine because they are not contained in a form, but explicitly labelling them as button, would be good because it's indicative that it has userland defined behaviour.
• ...but pagination changes the URL. This means that those buttons should really be links.
• ...because the URL changes, the content changes, and that new content isn't really announced to the user.
• ...you cannot put rel="next" on buttons, but you probably want to.

I recommend two things:

1. Update the title to say page x out of y (e.g. Page 3 out 7 of SleeplessByte JavaScript Solutions)
2. Move the focus to the paginated content

There's probably more work to be done.