Added disabling unused github features to pull request checklist

Author: lassoan

.github/PULL_REQUEST_TEMPLATE.md

@@ -26,5 +26,7 @@ Thank you for contributing to 3D Slicer!
   - [ ] Publication: link to publication and/or to PubMed reference (if available)
   - [ ] License: We suggest you use a permissive license that includes patent and contribution clauses.  This will help protect developers and ensure the code remains freely available.  We suggest you use the [Slicer License](https://github.com/Slicer/Slicer/blob/main/License.txt) or the [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0). Always mention in your README file the license you have chosen.  If you choose a different license, explain why to the extension maintainers. Depending on the license we may not be able to host your work. Read [here](https://opensource.guide/legal/#which-open-source-license-is-appropriate-for-my-project) to learn more about licenses.
   - [ ] Content of submitted s4ext file is consistent with the top-level CMakeLists.txt file in the repository (description, URLs, dependencies, etc. are the same)
-
+- Hide unused features in the repository to reduce noise/irrelevant information:
+  - [ ] Click `Settings` and in repository settings uncheck `Wiki`, `Projects`, and `Discussions` (if they are currently not used)
+  - [ ] Click the settings icon next to `About` in the top-right corner of the repository main page and uncheck `Releases` and `Packages` (if they are currently not used)
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