Remove torbutton and win32 directories from dist.tpo

I think we should remove the two following directories: https://dist.torproject.org/torbutton/ https://dist.torproject.org/win32/

The torbutton directory contains an old version of torbutton. Downloading this version of torbutton and using it is probably not a good idea.

The win32 directory contains a old version of Tor for Windows, which should probably not be used anymore. Instead Windows users should use the "expert bundle" which can be found in the torbrowser directory.