fixup/dedup contributing.md (#13944)

Author: drammock

.github/CONTRIBUTING.md

@@ -1,14 +1,20 @@
 Contributing to MNE-Python
 ==========================
 
-MNE-Python is maintained by a community of scientists and research labs. The project accepts contributions in the form of bug reports, fixes, feature additions, and documentation improvements (including typo corrections). The best way to start contributing is by [opening an issue](https://github.com/mne-tools/mne-python/issues/new/choose) on our GitHub page to discuss ideas for changes or enhancements, or to tell us about behavior that you think might be a bug. For *general troubleshooting* or *usage questions*, please consider posting your questions on our [MNE Forum](https://mne.discourse.group).
+Thanks for your interest in contributing to MNE-Python!
+The project accepts contributions in the form of bug reports, fixes, feature additions, and documentation improvements (including typo corrections).
+For *general troubleshooting* or *usage questions*, please post your questions on our [MNE Forum](https://mne.discourse.group).
 
-Users and contributors to MNE-Python are expected to follow our [code of conduct](https://github.com/mne-tools/.github/blob/main/CODE_OF_CONDUCT.md).
-
-The [contributing guide](https://mne.tools/dev/development/contributing.html) has details on the preferred contribution workflow
+The [contributing guide](https://mne.tools/dev/development/contributing.html) on our website has more details on the preferred contribution workflow
 and the recommended system configuration for a smooth contribution/development experience.
 
 
+Community Participation Guidelines
+----------------------------------
+
+Anyone participating in our online spaces is expected to follow our [Community Participation Guidelines and Code of Conduct](https://github.com/mne-tools/.github/blob/main/CODE_OF_CONDUCT.md).
+
+
 Policy on AI Assistance in Contributions
 ----------------------------------------
 Contributing to MNE-Python requires human judgment, contextual understanding, domain knowledge, and familiarity with MNE-Python’s structure and goals. It is not suitable for automatic processing by AI tools.