Add basic general log file

Signed-off-by: AnErrupTion <anerruption@disroot.org>

res/config.ini

@@ -199,6 +199,9 @@ login_defs_path = /etc/login.defs
 # no need to add `exec "$@"` at the end
 logout_cmd = null
 
+# General log file path
+ly_log = /var/log/ly.log
+
 # Main box horizontal margin
 margin_box_h = 2