added empire and worm to the index

Author: JenniferPylko

stories/introduction.md

@@ -6,6 +6,7 @@ These stories happen within the multiverse of OpenLore.
 
 - [Creation Myth](creation.md)
 - [The Demon Gate](demon-gate.md)
+- [Empire and Worm](empire-and-worm.md)
 - [Fall of a Deity](fall-of-a-deity.md)
 - [Orion's Sight](orions-sight.md)
 - [Sophocles Delta](sophocles-delta.md)