Defines a simple xontrib that adds a `cheatsheet` alias to open the project's README in a web browser. Demonstrates the pattern of setting up an alias in a xontrib and cleaning up temporary functions to avoid namespace pollution.

A self-contained script that demonstrates how to make an HTTP request using curl, process the output (count lines), handle errors, and produce colored output in the Xonsh shell. Uses argparse for argument parsing, argcomplete for tab completion, and the walrus operator for concise error checking.