remove unused FastCGI configuration file

backend/terahz.fcgi

@@ -1,7 +0,0 @@
-#!/usr/bin/python3
-# Minimal flup configuration for Flask
-from flup.server.fcgi import WSGIServer
-from app import app
-
-if __name__ == '__main__':
-    WSGIServer(app, bindAddress='/var/www/api/terahz.sock').run()