chore(tazjin/nixos): remove monica setup

I never ended up actually using this for anything.

Change-Id: I2bd9a46f6284d8283453d34eab6134efc92ea684
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11023
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>

users/tazjin/secrets/monica-appkey.age

@@ -1,18 +0,0 @@
-age-encryption.org/v1
--> ssh-ed25519 dcsaLw yLnCy26vP2A+ucjxVbIhwsw75P4HS9wZhoyJw0MooBI
-caQrANNnBIfZGNhfqldLAjfTbREIql8qbeSdjvYmbi4
--> ssh-ed25519 zcCuhA j4nZ2l0Az53JcomeIiUAYCgsRnFDCRO1soTln2SpAAk
-L62nxJ1fjvqmbEU1UUkVSj40Y4bqtAbITrs3MwXLjnk
--> ssh-rsa zXi7VA
-qp+lMhbup3yGVLU1qX5AJipZfQr4/5YcaOkSx9/nwyok0lGP9SeVtqUSnHSmbW+0
-xVAq/cE0LQaT6Yrcs3cXj5GRbxxM2zqJm06zSMvss0MOyXgNyymETFyQxed/O1Bx
-hW2sGpMbM3k4hHGtuzK9/1CWsf/4RoIp72vvvsTcTrE7dYiSAoxajUP9QjHBypAh
-ZKnWGCAwxhJpL17pyIAVIROciyHXiiPZXxKNr+IjBRcNYD64teTSNal/2kPSJkVn
-xqndMW/EqA8ppMRX73VqYRxrJlqPG4MOMrb/FHthGHeYcExZfFo8++psyE2M0zDh
-SDiL1Yzc9k+z0Hyi2Amwqw
--> ssh-ed25519 At5Mag 6deiVBNvCr9UdexUONnjyVVv1muIx3hOoAvhmBGLyEk
-4Bxv5kESIMXiLNvNed7RcNA55qpAhyrnXgKTNo7orlA
--> }@h-grease
-KOK4zfG7sUkTkn95+o1Ml4NZRPTEHWcemFBs9JhlUc0JlvNJFBLl
---- K+wQwIKEo8pnpZNsWghX/xU85PM7W2YvHvIPd8MNNlE
-éûeòÓ¬Ð-µ$Wéä9×Uµµ÷ªÞn<C39E>Ü…n²Êí_ȯ‘WXêbµú«x
¦5v|ÑOD	Ý£/.ý@}^’e<>íK«Œm\

users/tazjin/secrets/secrets.nix

@@ -11,6 +11,5 @@ let
 in
 {
   "tgsa-yandex.age".publicKeys = allKeys;
-  "monica-appkey.age".publicKeys = allKeys;
   "geesefs-tazjins-files.age".publicKeys = allKeys;
 }