Make necessary changes for 23.05

- Explicitly enable fish
- No longer use OpenSSL 1.1 for BURP (decryption now seems to work fine
  with current OpenSSL)
- Move sshd settings to `settings`

base/users.nix

@@ -3,6 +3,8 @@ let
     definedInPersonalDotNix = lib.mkDefault (throw "Configuration option missing from personal.nix");
 in
 {
+    programs.fish.enable = true;
+
     users.users = {
         fruchti = {
             isNormalUser = true;