Override the ttyper command with a function

Set values for the number of words and languages, as there isn't a word
setting to add to a `config.toml` file.

This is based on https://www.youtube.com/watch?v=C5aRtq-Rtbg by Greg
Hurrell.

lib/shared/modules/zsh.nix

@@ -58,6 +58,10 @@
         t "''${repo_path}"
       }
 
+      ttyper() {
+        command ${pkgs.ttyper}/bin/ttyper --language english1000 --words 50 "''${@}"
+      }
+
       # Plugins
       source "''${ZPLUG_REPOS}/joshskidmore/zsh-fzf-history-search/zsh-fzf-history-search.plugin.zsh"
       source "''${ZPLUG_REPOS}/robbyrussell/oh-my-zsh/plugins/git/git.plugin.zsh"