docs: update community support links to GitHub Discussions

Author: dermatz

.github/copilot-instructions.md

@@ -132,5 +132,5 @@ This project is licensed under GPL-3.0. By contributing, you agree that your wor
 ## Community
 
 - Report bugs and request features via GitHub Issues
-- Join the OpenForgeProject Discord community for support
+- Start discussions on GitHub Discussions
 - Follow the Contributing Guidelines in CONTRIBUTING.md

docs/advanced_usage.md

@@ -84,4 +84,4 @@ Common issues and solutions:
    - Clear Magento cache after theme builds
    - Verify theme registration in Magento
 
-For more help, join our [Discord community](https://discord.gg/H5CjMXQQHn) or open an issue on GitHub.
+For more help, open an issue on [GitHub Issues](https://github.com/OpenForgeProject/mageforge/issues) or start a discussion on [GitHub Discussions](https://github.com/OpenForgeProject/mageforge/discussions).