vimrc: set g:netrw_liststyle=3

Use Netrw's tree view. This makes Netrw function a lot more like
NERDTree. In fact, that's the primary reason why I use NERDTree in the
rare cases that I need it these days. We can probably remove NERDTree
from the plugin list after this.

Thanks very much to Mo Zhu for introducing me to this setting at
BostonRB project night last Tuesday.

Would have committed it then but I was thinking I'd do some plugin
changes and uninstall NERDTree before doing so. I haven't and now I want
to make another change to my vimrc so let's just commit this now.

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