Update button for more minimal style inspired by jupyterlab #47
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This is a quick attempt at implementing #46 to see how it looks and for feedback.
Note that it simplifies things a bit further, and doesn't have the blue line extend down below...I think that this makes it a little bit less intrusive and also doesn't shift the content horizontally. It uses the same blue as the JupyterLab UI default theme.
It also fixes a bug on the book theme where there'd be a "dangling" part of the admonition when it was hidden, and adds a bit of "hover interactivity" to make things more obvious when they're interactable.
Here's a demo:
closes #46