hard code theme name in stylesheet to avoid conflict

_config.yml

@@ -2,4 +2,4 @@ title: Hacker theme
 description: Hacker is a theme for GitHub Pages.
 show_downloads: true
 google_analytics:
-theme: jekyll-theme-hacker
+theme: 

assets/css/style.scss

@@ -1,4 +1,4 @@
 ---
 ---
 
-@import '{{ site.theme }}';
+@import 'jekyll-theme-hacker';