pixelfed doesn't use nginx caching or file streaming #21

looks like all files are hitting the pixelfed-app container rather than the top level nginx

one complication: nginx:alpine uses uid 101 for www-data while every other container assumes it matches debian's 33. we can hack that into the nginx container but it feels like a bit of a mess

cache must use Accept encoding in the key since the same URI is used for both json and html