Add "Copy" button to CODE blocks

conf.py

@@ -32,7 +32,7 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ["redirects", "notfound.extension"]
+extensions = ["redirects", "notfound.extension", "sphinx_copybutton"]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]