Please remove debian/bomberclone repository

Hi, this repository is empty and seems never used. My guess is it is a remaining of an attempt to migrate the repository https://anonscm.debian.org/git/collab-maint/bomberclone.git which was not finalised. Since I'm going to Salvage the package to Debian Games team the repository is not used and might be confusing here. Thank you for your work on Salsa, Andreas.