Add lazygit, remove unused stuff

Removes:
- eww
- khal

home/features/cli/khal.nix

@@ -1,25 +0,0 @@
-# TODO: sync theme with global theme
-{ pkgs, ... }:
-let calendarsHome = "productivity/calendars";
-in
-{
-  home.packages = with pkgs; [ khal ];
-  xdg.configFile."khal/config".text = ''
-    [calendars]
-      [[calendars]]
-        path = ~/${calendarsHome}/*
-        type = discover
-        color = dark magenta
-
-    [locale]
-      timeformat = %H:%M
-      dateformat = %d/%m/%Y
-
-    [view]
-      theme = light
-  '';
-
-  satellite.persistence.at.data.apps.khal.directories = [
-    calendarsHome
-  ];
-}