remove old nb module

modules/home-manager/default.nix

@@ -20,7 +20,6 @@ in
     ./git.nix
     ./kitty.nix
     ./mpv.nix
-    ./nb.nix
     ./neovim.nix
     ./splatmoji.nix
     ./ssh.nix

modules/home-manager/nb.nix

@@ -1,27 +0,0 @@
-# nb is a CLI-drive Personal Knowledge Manager
-# - <https://xwmx.github.io/nb/>
-#
-# it's pretty opinionated:
-# - autocommits (to git) excessively (disable-able)
-# - inserts its own index files to give deterministic names to files
-#
-# it offers a primitive web-server
-# and it offers some CLI query tools
-
-{ config, lib, pkgs, ... }:
-
-# lib.mkIf config.sane.home-manager.enable
-lib.mkIf false # XXX disabled!
-{
-  sane.packages.extraUserPkgs = [ pkgs.nb ];
-
-  home-manager.users.colin = { config, ... }: {
-    # nb markdown/personal knowledge manager
-    home.file.".nb/knowledge".source = config.lib.file.mkOutOfStoreSymlink "/home/colin/knowledge";
-    home.file.".nb/.current".text = "knowledge";
-    home.file.".nbrc".text = ''
-      # manage with `nb settings`
-      export NB_AUTO_SYNC=0
-    '';
-  };
-}