Omarchy install - capture install log (#868)

* Omarchy install log

* Slim down the logging setup a bit, put it in a known directory, tell user about it

* Stick to what was

* Not needed here

* Prefer the duplication

---------

Co-authored-by: David Heinemeier Hansson <david@hey.com>

install/log/after-install.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+echo -e "\n--- Pacman packages (after installation) ---"
+echo "Total packages installed: $(pacman -Q | wc -l)"
+pacman -Q