[Jekyll](EN) Fix Page build warning(about theme variable)
How to fix “Page build warning”(about theme setting) mail from github
Environment and Prerequisite
Sometimes we receive mail of which title is
Page build warning from github page.
... You are attempting to use a Jekyll theme, [Your theme name], which is not supported by GitHub Pages. ...
There are two solutions
1. Set to comment or erase theme variable in _config.yml
... #theme : [Any theme name on above link] ...
2. Add proper theme variable value in _config.yml
Set theme value to one of values in https://pages.github.com/themes/
... theme : [Any theme name on above link] ...