Moved out d3view

d3view is now in its own repo:
https://github.com/jbenet/ipfs-diag-net-d3-vis

This is so we can iterate on it quickly without having to
needlessly waste CI resources.

The repo also installs it for you:

```sh
git clone github.com/jbenet/ipfs-diag-net-d3-vis d3view
cd d3view
sudo make install
```