treewide: format all files (#57)

Run `nix fmt` at the root of the repository to format all files. I've
done this on my fork and this will help me merge your changes later
without having to deal with un-formatted files.

config/plugins/ui/startup.nix

@@ -74,7 +74,10 @@
     };
 
     options = {
-      paddings = [1 3];
+      paddings = [
+        1
+        3
+      ];
     };
 
     parts = [