[aur-general] dropping vim-nerdtree from community

[Thomas Dziedzic]

for anyone interested in maintaining it in the aur, it's free to adopt

I'm using vundle to manage my vim extensions so I have no need to
package vim plugins anymore.

Also, nerdtree 4.2.0 just came out so if someone adopts it, it will
need a minor update.

Cheers!