Please move builders/gitian-builder and builders/tor-browser-bundle to the attic

Those repos are no longer in use:

https://gitweb.torproject.org/builders/gitian-builder.git/ https://gitweb.torproject.org/builders/tor-browser-bundle.git/

Please move them to the attic.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information