Fix for displaying help for the build_python command (#601)

* Fix show help for jupyter-releaser build-python

* Revert new line

* Fix run test command

Author: rakhmaevao

CONTRIBUTING.md

@@ -50,7 +50,7 @@ jupyter-releaser --help
 To run the Python tests, use:
 
 ```bash
-pytest
+hatch run test:test
 ```
 
 ## Documentation

jupyter_releaser/cli.py

@@ -21,7 +21,7 @@ def invoke(self, ctx):
         """Handle jupyter-releaser config while invoking a command"""
         # Get the command name and make sure it is valid
         cmd_name = ctx.protected_args[0]
-        if cmd_name not in self.commands:
+        if cmd_name not in self.commands or "--help" in ctx.args:
             super().invoke(ctx)
 
         if cmd_name == "list-envvars":