exclude ".github" folder from "conf.py". (#866)

Signed-off-by: Tomoya.Fujita <tomoya.fujita825@gmail.com>

Author: fujitatomoya

conf.py

@@ -91,7 +91,7 @@
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This patterns also effect to html_static_path and html_extra_path
-exclude_patterns = ['venv', '_build','_themes','scripts', 'README.md' ]
+exclude_patterns = ['venv', '_build','_themes','scripts', 'README.md', '.github' ]
 
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'