Merge branch 'sandbox/pcoval/review/main' into 'main'

content: Update join-us page

See merge request eclipse-wg/oniro-wg/oniroproject.org!20

content/join-us/_index.md

@@ -4,4 +4,8 @@ seo_title: "Join Oniro Working Group"
 keywords: ["join Oniro", "Oniro", "open source", "working group"]
 ---
 
+* [Community's chat](https://docs.oniroproject.org/en/latest/community-chat-platform.html)
+* [Public working group's mailing list](https://accounts.eclipse.org/mailing-list/oniro-wg)
+* [Contact Oniro's staff](https://oniroproject.org/join-us/)
+
 {{< hubspot_contact_form portalId="5413615" formId="1279b5cf-d70f-4977-b585-b6885fac1d75" >}}