fix: Remove deprecated populate

src/notfellchen/main.py

@@ -18,10 +18,6 @@ def main():
             "forget to activate a virtual environment?"
         ) from exc
 
-    if sys.argv[1] == "populate":
-        from fellchensammlung.populate_with_testdata import populate_with_testdata
-        populate_with_testdata()
-
     execute_from_command_line(sys.argv)