home: remove unused 'secrets' module

home/default.nix

@@ -23,7 +23,6 @@
     ./packages.nix
     ./pager.nix
     ./power-alert.nix
-    ./secrets # Home-manager specific secrets
     ./ssh.nix
     ./terminal
     ./tmux.nix

home/secrets/.gitattributes

@@ -1,3 +0,0 @@
-* filter=git-crypt diff=git-crypt
-.gitattributes !filter !diff
-/default.nix !filter !diff

home/secrets/default.nix

@@ -1,31 +0,0 @@
-{ lib, ... }:
-
-with lib;
-let
-  throwOnCanary =
-    let
-      canaryHash = builtins.hashFile "sha256" ./canary;
-      expectedHash =
-        "9df8c065663197b5a1095122d48e140d3677d860343256abd5ab6e4fb4c696ab";
-    in
-    if canaryHash != expectedHash
-    then throw "Secrets are not readable. Have you run `git-crypt unlock`?"
-    else id;
-in
-throwOnCanary {
-  options.my.secrets = mkOption {
-    type =
-      let
-        valueType = with types; oneOf [
-          int
-          str
-          (attrsOf valueType)
-        ];
-      in
-      valueType;
-  };
-
-  config.my.secrets = {
-    # Home-manager secrets go here
-  };
-}