Remove docs for office hours (#470)

Remove references to office hours

Author: spier

CONTRIBUTING.md

@@ -9,7 +9,7 @@ For this working group to thrive, we welcome your contribution - be it small or
 Please consider contributing to the InnerSource Patterns.
 Here some suggestions on how you can contribute.
 
-1. **Share your thoughts & spark discussion**: A fresh perspective, an interesting thought, or an early novel idea can spark discussions and yield unforeseeable results. We invite you to share your thoughts on InnerSource-related topics at any time by [creating an issue](https://github.com/InnerSourceCommons/InnerSourcePatterns/issues/new), [via Slack, or our patterns office hours](#how-to-get-in-touch).
+1. **Share your thoughts & spark discussion**: A fresh perspective, an interesting thought, or an early novel idea can spark discussions and yield unforeseeable results. We invite you to share your thoughts on InnerSource-related topics at any time by [creating an issue](https://github.com/InnerSourceCommons/InnerSourcePatterns/issues/new) or [via Slack](#how-to-get-in-touch).
 
 2. **Read & improve existing patterns**: If you want to get started, we encourage you to read through the existing patterns and materials in this repository. Found a misleading phrase or phony grammar? A mistake in the content? Let us know by [creating an issue](https://github.com/InnerSourceCommons/InnerSourcePatterns/issues/new) or directly propose your fix as a pull request.
 
@@ -25,11 +25,11 @@ Here some suggestions on how you can contribute.
 
 ## How to get in touch?
 
-We are happy to support you in contributing to the InnerSource patterns or to just chat with you. You can reach out to us in the following ways:
+We are happy to support you in contributing to the InnerSource patterns or to just chat with you.
 
-1. **Via Slack.** Join the InnerSource Commons [Slack instance](https://isc-inviter.herokuapp.com/) and enter the `#innersource-patterns` channel there.
+You can best reach out to us **via Slack**:
 
-2. **During the patterns office hours.** We established a regular cadence of office hours for you to ask questions. Find the date of the next patterns office hours [in this calendar](https://innersourcecommons.org/patterns-officehours).
+Join the InnerSource Commons [Slack instance](https://isc-inviter.herokuapp.com/) and enter the `#innersource-patterns` channel there.
 
 ## License of Contributions