This is because you don’t have the proper gem locally, so you can either set the gem explicitly or add a gem github-pagesthat contains this theme, as it is supported by Github pages.
Add to your website Gemfile:
gem "github-pages", group: :jekyll_plugins
then run bundle install.
Change index.mdand modify the default layout on the value of: layout: default.
Remove lines containing tag to include about.md, for example: {% include icon-github.html username="jekyll" %}.
and you can use the new theme.
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