quests: add some more loot tables, rewrite intro questline a bit to guilde a newbie through to starting on the elements

config/ftbquests/quests/reward_tables/major_xp.snbt

@@ -0,0 +1,12 @@
+{
+	id: "6A8EB5C434976CDE"
+	loot_size: 1
+	order_index: 7
+	rewards: [{
+		auto: "enabled"
+		type: "xp_levels"
+		xp_levels: 5
+	}]
+	title: "Major XP"
+	use_title: true
+}