Flakeify home config

Use nix flakes instead of niv for pinning dependency channels.

First step towards merging my "nixos-system" and "nixos-home"
configs into a single trivially reproducible flake setup.

Apply home config via:

> nix build .#homeManagerConfigurations.common.activationPackage --impure
> ./result/activate

1 files changed, 1 insertions, 0 deletions

diff --git a/custom.nix b/custom.nix
index 918460a..38a0046 100644
--- a/custom.nix
+++ b/custom.nix
@@ -3,6 +3,7 @@
 let
   mkOption = pkgs.lib.mkOption;
   types = pkgs.lib.types;
+
 in {
   options.custom = {
     hidpi = mkOption {