cleanup whitespace and commas

* [] is now [ ]
* {} is now { }
* commas in arglists go at end of line not beginning

In short, I ran the whole thing through nixfmt-rfc-style but only
accepted about 30% of its changes. I might grow accustomed to more
of it over time

examples/rotuer-secrets.example.nix

@@ -8,12 +8,10 @@
   root = {
     #  mkpasswd -m sha512crypt
     passwd = "$6$6pt0mpbgcB7kC2RJ$kSBoCYGyi1.qxt7dqmexLj1l8E6oTZJZmfGyJSsMYMW.jlsETxdgQSdv6ptOYDM7DHAwf6vLG0pz3UD31XBfC1";
-    openssh.authorizedKeys.keys = [
-    ];
+    openssh.authorizedKeys.keys = [ ];
   };
 
   lan = {
     prefix = "10.8.0";
   };
-
 }