Merge master into staging-nixos

- All Xfce packages have been moved to top level (e.g. if you previously added `pkgs.xfce.xfce4-whiskermenu-plugin` to `environment.systemPackages`, you will need to change it to `pkgs.xfce4-whiskermenu-plugin`). The `xfce` scope will be removed in NixOS 26.11.

- The Dovecot IMAP server has been updated to version 2.4, with the `dovecot` attribute now referring to this backwards-incompatible version. The attribute `dovecot_2_3` refers to the previous version. The Pigeonhole plugin has been similarly updated to 2.4, with the version compatible with Dovecot 2.3 being at `dovecot_pigeonhole_0_5`. See <https://doc.dovecot.org/latest/installation/upgrade/2.3-to-2.4.html> for more information on how to upgrade.

- `spacefm` was removed because it appeared to be unmaintained upstream.

- `vimPlugins.nvim-treesitter` has been updated to `main` branch, which is a full and incompatible rewrite. If you can't or don't want to update, you should use `vimPlugins.nvim-treesitter-legacy`.

    name = "Serg Nesterov";

    keys = [ { fingerprint = "6E7D BA30 DB5D BA60 693C  3BE3 1512 F6EB 84AE CC8C"; } ];

  };

  cvengler = {

    name = "Clara Engler";

    github = "cvengler";

    githubId = 12272949;

  };

  cwoac = {

    email = "oliver@codersoffortune.net";

    github = "cwoac";

    githubId = 44043764;

    name = "Liam Hupfer";

  };

  hqurve = {

    email = "hqurve@outlook.com";

    github = "hqurve";

    githubId = 53281855;

    name = "hqurve";

  };

  hraban = {

    email = "hraban@0brg.net";

    github = "hraban";

    - For shortlived certificates with a total validty below 10 days renewal

      will happen after half of the total lifetime has passed

- The module for the Dovecot IMAP server, *services.dovecot*, now uses RFC-42-style settings, exposing a structured interface to write the configuration file.

  Also see the list of available settings for [Dovecot 2.3](https://doc.dovecot.org/2.3/settings/core/) or [2.4](https://doc.dovecot.org/2.4.2/core/summaries/settings.html).

- Cinnamon has been updated to 6.6, please check the [upstream announcement](https://www.linuxmint.com/rel_zena_whatsnew.php) for more details.

- Budgie has been updated to 10.10, please check the [upstream announcement](https://buddiesofbudgie.org/blog/budgie-10-10-released) for more details.

      postInstall = ''

        ln -s ${cfg.stateDir}/sites $out/share/php/${cfg.package.pname}${cfg.webRoot}

        ln -s ${cfg.modulesDir} $out/share/php/${cfg.package.pname}/modules

        ln -s ${cfg.themesDir} $out/share/php/${cfg.package.pname}/themes

        ln -s ${cfg.modulesDir} $out/share/php/${cfg.package.pname}${cfg.webRoot}/modules/nixos-modules

        ln -s ${cfg.themesDir} $out/share/php/${cfg.package.pname}${cfg.webRoot}/themes/nixos-themes

      '';

    });