[amitu]

I am working on fifthtry.com to solve exactly this problem.

We organise stuff in tree. Eg you can see my person blog hosted on it: www.fifthtry.com/amitu/.

We are working integrating with diagram tools.

Regarding sync: we connect with github and block pull request till it is documented and approved on fifthtry.

Would love to demo it to you if interested, email in my profile.