renamed mod -> modules in hosts->kepler | add /etc/nixos to git as safe dir

hosts/kepler/modules/freedom/invidious.nix

@@ -0,0 +1,9 @@
+{ config, pkgs, ... }:
+{
+  services = {
+    invidious = {
+      enable = true;
+      port = 3001;
+    };
+  };
+}