[Docs] Mention GitHub Discussions in README

Signed-off-by: Dmitrii Kuvaiskii <[email protected]>

README.rst

@@ -75,13 +75,15 @@ with Gramine for their confidential computing solutions.
 Getting help
 ============
 
-For any questions, please send an email to [email protected]
-(`public archive <https://groups.google.com/g/gramine-users>`__) or join us on
-our `Gitter chat <https://gitter.im/gramineproject/community>`__.
+For any questions, please use `GitHub Discussions
+<https://github.com/gramineproject/gramine/discussions>`__ or join us on our
+`Gitter chat <https://gitter.im/gramineproject/community>`__.
 
-For bug reports, post an issue on our GitHub repository:
-https://github.com/gramineproject/gramine/issues.
+For bug reports and feature requests, `post an issue on our GitHub repository
+<https://github.com/gramineproject/gramine/issues>`__.
 
+If you prefer emails, please send them to [email protected]
+(`public archive <https://groups.google.com/g/gramine-users>`__).
 
 Reporting security issues
 =========================