Fix Discord invite link

Add release announcements link, consolidate Community section

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
   - name: Questions & Help
-    url: https://discord.gg/Jd8Vphy9jq
+    url: https://discord.gg/35wsABTejz
     about: For usage questions, troubleshooting help, and general discussion, please visit our Discord instead of opening an issue.

README.md

@@ -185,6 +185,6 @@ MIT License - see LICENSE file for details
 
 Superpowers is built by [Jesse Vincent](https://blog.fsck.com) and the rest of the folks at [Prime Radiant](https://primeradiant.com).
 
-- **Discord**: [Join us](https://discord.gg/Jd8Vphy9jq) for community support, questions, and sharing what you're building with Superpowers
+- **Discord**: [Join us](https://discord.gg/35wsABTejz) for community support, questions, and sharing what you're building with Superpowers
 - **Issues**: https://github.com/obra/superpowers/issues
 - **Release announcements**: [Sign up](https://primeradiant.com/superpowers/) to get notified about new versions