Update theme for gh pages (#103)

Author: salmer

_config.yml

@@ -1,3 +1,5 @@
-theme: jekyll-theme-cayman
+# Used theme: https://github.com/pages-themes/cayman
+remote_theme: pages-themes/[email protected]
 plugins:
+  - jekyll-remote-theme
   - jemoji