@Shaun when 0.5.0 is released, their will be full documentation, but the process will be something along the lines of
git checkout v0.5.x
But their will be an announcement about all of that and how to update when it's ready. If you have any other issues with plugins etc, feel free to create a topic.
Sounds like its doable. Apparently you can embed Hackpad on your site using their code:
<script src=“https://hackpad.com/<string>.js”></script><noscript><div>View <a href=“https://hackpad.com/<string>.js”>To-Do</a></div></noscript>
So all you'd have to do is create a static page maybe and paste the above in a template