change time zone to UTC

advantages:
- avoids daylight savings time issues
- generally UTC is used as a default in languages so it's easier to work with than a different local time
- we don't much care about what time it physically is by the server when using it

Change-Id: Ifa5db94f1504cfbf34fa3fea975f61106432ca0e
Reviewed-on: https://git.clicks.codes/c/Clicks/NixFiles/+/165
Reviewed-by: Ash Franks <pineafan@clicks.codes>
Reviewed-by: Skyler Grey <minion@clicks.codes>
Tested-by: Ash Franks <pineafan@clicks.codes>
diff --git a/default/configuration.nix b/default/configuration.nix
index 929c785..6d916de 100644
--- a/default/configuration.nix
+++ b/default/configuration.nix
@@ -19,7 +19,7 @@
   # networking.networkmanager.enable = true;  # Easiest to use and most distros use this by default.
 
   # Set your time zone.
-  time.timeZone = "America/New_York";
+  time.timeZone = "Etc/UTC";
 
   # Configure network proxy if necessary
   # networking.proxy.default = "http://user:password@proxy:port/";