Clean up secret management

Update readme

secrets/README.md

@@ -1,3 +0,0 @@
-```bash
-nix run github:ryantm/agenix# -- -e secret1.age
-```

secrets/secrets.nix

@@ -1,17 +0,0 @@
-let
-  pkgs = import <nixpkgs> { };
-  publicKeysURL =
-    "https://git.kun.is/pim.keys"; # https://github.com/pizzapim.keys
-  publicKeysFile = builtins.fetchurl { url = publicKeysURL; };
-  publicKeys = pkgs.lib.strings.splitString "\n"
-    (pkgs.lib.strings.fileContents publicKeysFile);
-in
-{
-  "wg-quick-home-privkey.age".publicKeys = publicKeys;
-  "wg-quick-home-preshared-key.age".publicKeys = publicKeys;
-  "syncthing-key.pem.age".publicKeys = publicKeys;
-  "syncthing-cert.pem.age".publicKeys = publicKeys;
-  "keepassxc.ini.age".publicKeys =
-    publicKeys; # Secret agent causes private keys in config file.
-  "sops-keys.txt.age".publicKeys = publicKeys;
-}