content: add community calls and Slack details to both the index and contrib pages

Signed-off-by: Jiaxiao (mossaka) Zhou <[email protected]>

Author: Mossaka

content/en/_index.md

@@ -57,4 +57,10 @@ similar to traditional container workloads.
 trigger designed specifically for Spin. It enables seamless integration between Spin and MQTT-based
 systems, allowing you to automate workflows and trigger actions based on MQTT messages.
 
+### Get Involved
+
+We have bi-weekly [community calls](https://docs.google.com/document/d/10is2YoNC0NpXw4_5lSyTfpPph9_A9wBissKGrpFaIrI/edit?usp=sharing) and a [Slack channel](https://cloud-native.slack.com/archives/C06PC7JA1EE). We would love to have you join us! <br>
+
+Check out the [contribution guidelines](/docs/contrib/) to learn how to get involved with the project.
+
 {{% /blocks/lead %}}

content/en/docs/contrib/_index.md

@@ -8,3 +8,22 @@ aliases:
 
 SpinKube is an open source community-driven project. You can contribute in many ways, either to the
 project or to the wider community.
+
+## Community Calls
+
+Join our bi-weekly community calls to connect with the team and other contributors. These calls are a great opportunity to listen in, ask questions, or share your ideas!
+
+* When: Bi-weekly at 8:00 am PT / 11:00 am ET / 5:00 pm CET
+
+* Meeting Document: [Community Call Notes](https://docs.google.com/document/d/10is2YoNC0NpXw4_5lSyTfpPph9_A9wBissKGrpFaIrI/edit?usp=sharing)
+
+* Zoom Link: Join [the Zoom Meeting](https://us06web.zoom.us/j/83473056051?pwd=gDFNQCxUG1OMzdBqTNXIQamlvHjhFo.1)
+
+## Slack
+
+Connect with the community on Slack for real-time discussions and updates:
+
+visit the `#spinkube` channel on the [CNCF
+Slack](https://cloud-native.slack.com/archives/C06PC7JA1EE).
+
+We look forward to seeing you there!