formatter: remove script, add treefmt.toml + keep-sorted (#7056)

currently ./format does a bunch of stuff with git that was only necessary for nixfmt but not nixfmt-tree, so I deleted it (just use treefmt command directly instead). I also added keep sorted to keep the really long module lists sorted (already used in nixpkgs).

modules/modules.nix

@@ -15,11 +15,13 @@ let
 
   modules =
     [
-      ./accounts/email.nix
+      # keep-sorted start case=no numeric=yes
       ./accounts/calendar.nix
       ./accounts/contacts.nix
+      ./accounts/email.nix
       ./config/home-cursor.nix
       ./config/i18n.nix
+      ./dbus.nix
       ./files.nix
       ./home-environment.nix
       ./i18n/input-method/default.nix
@@ -33,6 +35,7 @@ let
       ./misc/lib.nix
       ./misc/mozilla-messaging-hosts.nix
       ./misc/news.nix
+      ./misc/nix.nix
       ./misc/nixgl.nix
       ./misc/numlock.nix
       ./misc/pam.nix
@@ -68,10 +71,10 @@ let
       ./programs/autojump.nix
       ./programs/autorandr.nix
       ./programs/awscli.nix
+      ./programs/bacon.nix
       ./programs/bash.nix
       ./programs/bashmount.nix
       ./programs/bat.nix
-      ./programs/bacon.nix
       ./programs/beets.nix
       ./programs/bemenu.nix
       ./programs/borgmatic.nix
@@ -107,14 +110,15 @@ let
       ./programs/firefox.nix
       ./programs/fish.nix
       ./programs/floorp.nix
+      ./programs/foliate.nix
       ./programs/foot.nix
       ./programs/freetube.nix
       ./programs/fuzzel.nix
       ./programs/fzf.nix
       ./programs/gallery-dl.nix
       ./programs/getmail.nix
-      ./programs/gh.nix
       ./programs/gh-dash.nix
+      ./programs/gh.nix
       ./programs/ghostty.nix
       ./programs/git-cliff.nix
       ./programs/git-credential-oauth.nix
@@ -149,11 +153,11 @@ let
       ./programs/irssi.nix
       ./programs/java.nix
       ./programs/jetbrains-remote.nix
+      ./programs/joplin-desktop.nix
+      ./programs/joshuto.nix
       ./programs/jq.nix
       ./programs/jqp.nix
       ./programs/jujutsu.nix
-      ./programs/joshuto.nix
-      ./programs/joplin-desktop.nix
       ./programs/just.nix
       ./programs/k9s.nix
       ./programs/kakoune.nix
@@ -238,15 +242,17 @@ let
       ./programs/pubs.nix
       ./programs/pyenv.nix
       ./programs/pylint.nix
+      ./programs/pywal.nix
       ./programs/qcal.nix
       ./programs/qutebrowser.nix
       ./programs/ranger.nix
+      ./programs/rbenv.nix
       ./programs/rbw.nix
       ./programs/rclone.nix
       ./programs/readline.nix
       ./programs/rio.nix
-      ./programs/ripgrep.nix
       ./programs/ripgrep-all.nix
+      ./programs/ripgrep.nix
       ./programs/rmpc.nix
       ./programs/rofi-pass.nix
       ./programs/rofi.nix
@@ -288,8 +294,8 @@ let
       ./programs/tiny.nix
       ./programs/tmate.nix
       ./programs/tmux.nix
-      ./programs/tofi.nix
       ./programs/todoman.nix
+      ./programs/tofi.nix
       ./programs/topgrade.nix
       ./programs/translate-shell.nix
       ./programs/urxvt.nix
@@ -300,16 +306,14 @@ let
       ./programs/vim-vint.nix
       ./programs/vim.nix
       ./programs/vinegar.nix
+      ./programs/visidata.nix
       ./programs/vscode.nix
       ./programs/vscode/haskell.nix
-      ./programs/visidata.nix
-      ./programs/pywal.nix
-      ./programs/rbenv.nix
       ./programs/wallust.nix
       ./programs/watson.nix
       ./programs/waveterm.nix
-      ./programs/waylogout.nix
       ./programs/waybar.nix
+      ./programs/waylogout.nix
       ./programs/wayprompt.nix
       ./programs/wezterm.nix
       ./programs/wlogout.nix
@@ -359,12 +363,11 @@ let
       ./services/dwm-status.nix
       ./services/easyeffects.nix
       ./services/emacs.nix
-      ./services/etesync-dav.nix
       ./services/espanso.nix
+      ./services/etesync-dav.nix
       ./services/flameshot.nix
       ./services/fluidsynth.nix
       ./services/fnott.nix
-      ./programs/foliate.nix
       ./services/fusuma.nix
       ./services/getmail.nix
       ./services/git-sync.nix
@@ -398,11 +401,11 @@ let
       ./services/mbsync.nix
       ./services/megasync.nix
       ./services/mopidy.nix
+      ./services/mpd-discord-rpc.nix
+      ./services/mpd-mpris.nix
       ./services/mpd.nix
       ./services/mpdris2.nix
       ./services/mpdscribble.nix
-      ./services/mpd-discord-rpc.nix
-      ./services/mpd-mpris.nix
       ./services/mpris-proxy.nix
       ./services/muchsync.nix
       ./services/network-manager-applet.nix
@@ -492,13 +495,12 @@ let
       ./services/xsuspender.nix
       ./services/yubikey-agent.nix
       ./systemd.nix
-      ./dbus.nix
       ./targets/darwin
       ./targets/generic-linux.nix
       ./wayland.nix
       ./xresources.nix
       ./xsession.nix
-      ./misc/nix.nix
+      # keep-sorted end
       (pkgs.path + "/nixos/modules/misc/assertions.nix")
       (pkgs.path + "/nixos/modules/misc/meta.nix")