Enable multiple workers in default uwsgi config

uwsgi.ini

 [uwsgi]
 plugin = python3
 manage-script-name = true
-workers = %k*2
 
 uid = uffd
 gid = uffd
 
 vacuum = true
+master = true
+
+process = 2
+threads = 4
+buffer-size = 8192 ; this buffer is used for http headers and defaults to 4k
+single-interpreter = true
+need-app = true
 
 env = PYTHONIOENCODING=UTF-8
 env = LANG=en_GB.utf8