start factoring Key actions into functions

config.h

@@ -5,3 +5,10 @@ static const struct xkb_rule_names xkb_rules = {
 	.variant = NULL,
 	.options = "ctrl:nocaps,altwin:swap_lalt_lwin,terminate:ctrl_alt_bksp",
 };
+
+#define MODKEY WLR_MODIFIER_ALT
+
+static const Key keys[] = {
+	{ MODKEY, XKB_KEY_Escape, quit,      {0} },
+	{ MODKEY, XKB_KEY_F1,     focusnext, {0} },
+};