update python installation configuration

some changes:
- move pythonrc to be copied to ~/.config/python/pythonrc*.py*, instead
  of ~/.config/python/pythonrc.py
- remove spurious print statement from pythonrc.py

.config/python/pythonrc.py

@@ -14,6 +14,4 @@ def write_history():
     except OSError:
         pass
 
-print("laskdjflaskfjd")
-
 atexit.register(write_history)

home/python/default.nix

@@ -2,7 +2,7 @@
 
 {
   home.file = {
-    ".config/python/pythonrc" = {
+    ".config/python/pythonrc.py" = {
       source = ../../.config/python/pythonrc.py;
     };
   };