Update link to GitHub Discussions beta

.github/ISSUE_TEMPLATE/8.Question_about_next.md

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 name: Question about Next.js
-about: If you have a question related to Next.js or the examples. Reach out to the community on https://spectrum.chat/next-js
+about: If you have a question related to Next.js or the examples. Reach out to the community on GitHub discussions
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 # Question about Next.js
 
-GitHub Issues are reserved for Bug reports and Feature requests. The best place to get your question answered is to post it on https://spectrum.chat/next-js.
+GitHub Issues are reserved for Bug reports and Feature requests.
+
+The best place to get your question answered is to post it on GitHub Discussions: https://github.com/zeit/next.js/discussions/new.