Known for having good prices, a great selection, and and a terrible location, Georgetown’s Dixie Liquor was for decades a supplier of kegs to Georgetown students and young District residents alike. This week, though, it closes its doors, taking its kegs and surly employees with it. I found out the way no keg-seeker should — I showed up on Saturday afternoon money in hand, only to be informed that due to their impending closure, no…