Set better theme (#14)

Cleaner, nicer:
![image](https://user-images.githubusercontent.com/183673/49167525-d492b200-f335-11e8-9860-f3884c39d992.png)
diff --git a/_config.yml b/_config.yml
index cc35c1d..9282054 100644
--- a/_config.yml
+++ b/_config.yml
@@ -1 +1 @@
-theme: jekyll-theme-modernist
\ No newline at end of file
+remote_theme: jekyll/minima