github issue forum link (#2335)

* github issue forum link

* Update .github/ISSUE_TEMPLATE/config.yml
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

---------
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

.github/ISSUE_TEMPLATE/config.yml

 contact_links:
   - name: Blank issue
     url: https://github.com/huggingface/diffusers/issues/new
+    about: Other
+  - name: Forum
+    url: https://discuss.huggingface.co/
     about: General usage questions and community discussions
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