chore: update discord links (#10301)

update discord links

.github/ISSUE_TEMPLATE/config.yml

@@ -1,11 +1,11 @@
 blank_issues_enabled: false
 contact_links:
   - name: I have a question or need support
-    url: https://discord.gg/D8JsnBEuKb
+    url: https://discord.immich.app
     about: We use GitHub for tracking bugs, please check out our Discord channel for freaky fast support.
   - name: Feature Request
     url: https://github.com/immich-app/immich/discussions/new?category=feature-request
     about: Please use our GitHub Discussion for making feature requests.
   - name: I'm unsure where to go
-    url: https://discord.gg/D8JsnBEuKb
+    url: https://discord.immich.app
     about: If you are unsure where to go, then joining our Discord is recommended; Just ask!