Bring hypothes.is support *back* to epub.js

[BigBlueHat]

5 months ago epub.js had Hypothes.is working (afaik) and available in an example in their repo:
https://github.com/futurepress/epub.js/blob/master/examples/hypothesis.html

It's including a lot of static assets which have now moved or are gone or bundled now.

Regardless, it's likely we've changed some stuff, and need to update how it's loading.

I'll be reporting the issue at the epub.js project also and tracking what I can there, but doing it here for us to have a "visionary" issue to track this with. 📹

[BigBlueHat]

Early anchoring / URL bug:
futurepress/epubjs-reader#21

[BigBlueHat]

/me throwing my 🎩 over the fence:
futurepress/epub.js#157

[BigBlueHat]

/me summons @RawKStar77

[dwhly]

Thanks for this Hat!

[JakeHartnell]

Awesome! I shall reply more in depth on futurepress/epub.js#157

[tilgovi]

Going to just let us track this at futurepress/epub.js#157
I pinged that issue.