Remove Discord placeholder from issue config

Co-authored-by: xavierarpa <44328679+xavierarpa@users.noreply.github.com>

Author: Copilot

.github/ISSUE_TEMPLATE/config.yml

@@ -1,8 +1,5 @@
 blank_issues_enabled: false
 contact_links:
-  - name: 💬 Discord Community
-    url: https://discord.gg/your-discord-link
-    about: Join our Discord server for questions and discussions
   - name: 📚 Documentation
     url: https://xavierarpa.gitbook.io/uniflux
     about: Check out the full documentation