Update instructions for production deployment

docs/nginx_photos

@@ -43,7 +43,7 @@ server {
     }
 
     location / {
-        uwsgi_pass unix:///var/www/photos/photos21/photos21.sock;
+        uwsgi_pass unix:///var/run/uwsgi/app/uwsgi_photos/socket;
         include /etc/nginx/uwsgi_params;
     }
 }

docs/uwsgi_photos.ini

@@ -13,9 +13,7 @@ plugin          = python3
 master          = true
 # maximum number of worker processes
 processes       = 10
-# the socket (use the full path to be safe
-socket          = /var/www/photos/photos21/photos21.sock
-# ... with appropriate permissions - may be needed
+# socket with appropriate permissions in /var/run/uwsgi/app/uwsgi_photos/socket
 chmod-socket    = 664
 # clear environment on exit
 vacuum          = true