Update Discord link in README.MD to new AIFoundryDiscord URL

Co-authored-by: mikekinsman <[email protected]>

Author: Copilot

README.MD

@@ -46,7 +46,7 @@ By the end of this session, learners will be able to:
 | Resources                          | Links                                                                                                                            | Description                                  |
 | :--------------------------------- | :------------------------------------------------------------------------------------------------------------------------------- | :------------------------------------------- |
 | AI Tour 2026 Resource Center       | https://aka.ms/AITour26-Resource-center                                                                                          | Links to all repos for AI Tour 26 Sessions   |
-| Azure AI Foundry Community Discord | [![Microsoft Azure AI Foundry Discord](https://dcbadge.limes.pink/api/server/Pwpvf3TWaw)](https://discord.gg/Pwpvf3TWaw) | Connect with the Azure AI Foundry Community! |
+| Azure AI Foundry Community Discord | [![Microsoft Azure AI Foundry Discord](https://dcbadge.limes.pink/api/server/Pwpvf3TWaw)](https://aka.ms/AIFoundryDiscord-AITour26) | Connect with the Azure AI Foundry Community! |
 | Learn at AI Tour                   | https://aka.ms/LearnAtAITour                                                                                                     | Continue learning on Microsoft Learn         |
 
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