Fix Discord badge link in README

Updated Discord badge link in README.

Author: amynic

README.md

@@ -20,7 +20,7 @@
 
 Chat with other developers and AI Engineers, attend live community sessions hosted by Microsoft product teams and get support from product experts.
 
-[![Microsoft Foundry Discord](https://dcbadge.limes.pink/api/server/https://discord.gg/microsoftfoundry)](https://discord.gg/microsoftfoundry)
+[![Microsoft Foundry Discord](https://dcbadge.limes.pink/api/server/nTYy5BXMWG)](https://discord.gg/nTYy5BXMWG)
 
 ### [GitHub](https://aka.ms/foundry/forum)