Update _config.yml

Author: xuleixie

_config.yml

@@ -100,7 +100,7 @@ ignore:
 # Extensions
 ## Plugins: https://hexo.io/plugins/
 ## Themes: https://hexo.io/themes/
-theme: freemind
+theme: jekyll-theme-minimal
 inverse: true
 # Deployment
 ## Docs: https://hexo.io/docs/one-command-deployment