Update Good First Issue template (#2572)

### Changes / Reason for changes

Context: openvinotoolkit/openvino#23409

### Related tickets

N/A

.github/ISSUE_TEMPLATE/good_first_issue.yml

@@ -42,6 +42,8 @@ body:
           discussions, guides.
       value: |
           - [Contribution guide - start here!](https://github.com/openvinotoolkit/nncf/blob/develop/CONTRIBUTING.md)
+          - [Intel DevHub Discord channel](https://discord.gg/7pVRxUwdWG) - engage in discussions, ask questions and talk to OpenVINO developers
+          - [How to link your Pull Request to an issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#manually-linking-a-pull-request-to-an-issue-using-the-pull-request-sidebar)
     validations:
       required: true