Add sphinx copy button (#6694)

* Add sphinx copy button

* Update requirements-doc.txt

Co-authored-by: Robert Nishihara <robertnishihara@gmail.com>

doc/requirements-doc.txt

@@ -1,26 +1,27 @@
-colorama
+blist
 click
+colorama
 filelock
+flask
 flatbuffers
 funcsigs
 jsonschema
 mock
 numpy
 opencv-python-headless
+pandas
 pyarrow
+pygments
 pyyaml
 recommonmark
 redis
 setproctitle
 sphinx
 sphinx-click
+sphinx-copybutton
 sphinx-gallery
 sphinx-jsonschema
 sphinx_rtd_theme
 tabulate
-pandas
-flask
 uvicorn
-pygments
 werkzeug
-blist

doc/source/conf.py

@@ -72,8 +72,13 @@ sys.path.insert(0, os.path.abspath("../../python/"))
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'sphinx.ext.autodoc', 'sphinx.ext.viewcode', 'sphinx.ext.napoleon',
-    'sphinx_click.ext', 'sphinx-jsonschema', 'sphinx_gallery.gen_gallery'
+    'sphinx.ext.autodoc',
+    'sphinx.ext.viewcode',
+    'sphinx.ext.napoleon',
+    'sphinx_click.ext',
+    'sphinx-jsonschema',
+    'sphinx_gallery.gen_gallery',
+    'sphinx_copybutton',
 ]
 
 sphinx_gallery_conf = {