doc: draft URL scheme documentation
doc: draft URL scheme documentation

note: at present only the first redirect for (pkg/version) is implemented,
suite aliases and "latest" are still missing

devoxel/debsources,zacchiro/debsources,Debian/debsources,zacchiro/debsources,Debian/debsources,devoxel/debsources,clemux/debsources,zacchiro/debsources,vivekanand1101/debsources,sophiejjj/debsources,sophiejjj/debsources,devoxel/debsources,vivekanand1101/debsources,oorestisime/debsources,oorestisime/debsources,matthieucan/debsources,oorestisime/debsources,zacchiro/debsources,nonas/debian-qa,sophiejjj/debsources,zacchiro/debsources,Debian/debsources,devoxel/debsources,matthieucan/debsources,nonas/debian-qa,matthieucan/debsources,vivekanand1101/debsources,nonas/debian-qa,matthieucan/debsources,clemux/debsources,clemux/debsources,clemux/debsources,Debian/debsources,sophiejjj/debsources,oorestisime/debsources,sophiejjj/debsources,oorestisime/debsources,vivekanand1101/debsources,clemux/debsources,vivekanand1101/debsources,Debian/debsources,devoxel/debsources,matthieucan/debsources,nonas/debian-qa