add ruff config

run files through formatter

add dosctrings to satisfy the linter

src/slobs_cli/errors.py

@@ -1,3 +1,5 @@
+"""module for custom exceptions in Slobs CLI."""
+
 import asyncclick as click
 
 
@@ -5,9 +7,10 @@ class SlobsCliError(click.ClickException):
     """Base class for all Slobs CLI errors."""
 
     def __init__(self, message: str):
+        """Initialize the SlobsCliError with a message."""
         super().__init__(message)
         self.exit_code = 1
 
     def show(self):
         """Display the error message in red."""
-        click.secho(f"Error: {self.message}", fg="red", err=True)
+        click.secho(f'Error: {self.message}', fg='red', err=True)