feat: add sphinx-click and nbsphinx support

Author: aksiome

docs/_code/__init__.py

@@ -0,0 +1,22 @@
+"""Example Click CLI application for sphinx-click documentation."""
+
+import click
+
+
+@click.group()
+def greet():
+    """A sample command group."""
+    pass
+
+
+@greet.command()
+@click.argument("user", envvar="USER")
+def hello(user):
+    """Greet a user."""
+    click.echo("Hello %s" % user)
+
+
+@greet.command()
+def world():
+    """Greet the world."""
+    click.echo("Hello world!")

docs/_code/click_example.py

@@ -1,6 +1,9 @@
 """Configuration file for the Sphinx documentation builder."""
 
 import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "_code"))
 
 # -- Project information -----------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information