Update Hypothes.is integration.
Got Hypothes.is integration working again.

Still need to work on stylings. Currently the sidebar is not visible due to a low z-index, but I would like to do a better looking integration when I find time.

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Fixed up example so you can actually view/make annotations.

Much work still needs to be done on UX / UI, but at least now this isn't completely broken.
Merge pull request #171 from futurepress/hypothesis-integration

Fix Hypothesis integration