Merge pull request #420 from ektravel/community-link

Add links to Druid Community page
diff --git a/src/pages/community/index.mdx b/src/pages/community/index.mdx
index 6bb2423..f7159e9 100644
--- a/src/pages/community/index.mdx
+++ b/src/pages/community/index.mdx
@@ -29,11 +29,15 @@
 
 * **User mailing list:** [druid-user@googlegroups.com](https://groups.google.com/forum/#!forum/druid-user) for general
 discussion, questions, and announcements.
-* **LinkedIn** Connect with other Apache Druid professionals in the [LinkedIn group](https://www.linkedin.com/groups/8791983/)
+* **LinkedIn** Connect with other Apache Druid professionals in the [LinkedIn group](https://www.linkedin.com/groups/8791983/).
 * **Meetups:** Check out [Apache Druid on meetup.com](https://www.meetup.com/topics/apache-druid/) for links to regular
 meetups in cities all over the world.
 * **StackOverflow:** While the user mailing list is the primary resource for asking questions, if you prefer
 StackOverflow, make sure to tag your question with `druid` or `apache-druid`.
+* **Linen:** Check out the [Apache Druid community on Linen](https://www.linen.dev/s/apache-druid/c/troubleshooting) for a digital archive of Apache Druid Slack threads. 
+While Slack limits message history to the last 90 days, you can continue to access older threads on Linen.
+* **Struct:** Check out [Apache Druid on Struct](https://druid.struct.ai/kb) for AI-generated knowledge base from Apache Druid Slack threads. 
+Similar to Linen, Struct archives Slack threads so that you can continue to access messages beyond Slack's 90 day retention period.
 
 ## Getting help