zshrc: add dotfiles update function

zsh/zshrc

@@ -79,5 +79,11 @@ export EDITOR="vim"
 alias svim="sudoedit"
 alias unlock="gpg -o /dev/null -s /dev/null"
 
+function dotfiles-update() {
+  pushd "$(dirname "$(dirname "$(readlink -f "$HOME/.zshrc")")")" >> /dev/null
+  git pull
+  popd >> /dev/null
+}
+
 # To customize prompt, run `p10k configure` or edit ~/.p10k.zsh.
 [[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh