Use router

Trying something new for the navigation of this site and the choose your own adventure approach. To implement a button-style navigation and clean up the prior approach this is a start at implementing vue-router. I set this up so each frame, or "chapter" that's in content.json as an array has a router link. They are navigated linearly.

There's more to come, btu looking for initial feedback on this set up. The numbers following chapter id in the url aren't updating, not sure why. Otherwise there should be basic navigation that moves through the text.