Remove calendly link from README (#3853)

README.md

@@ -50,7 +50,7 @@ Here is a [step-by-step guide](https://github.com/airbytehq/airbyte/tree/e378d40
 
 We love contributions to Airbyte, big or small.
 
-See our [Contributing guide](docs/contributing-to-airbyte/) on how to get started. Not sure where to start? We’ve listed some [good first issues](https://github.com/airbytehq/airbyte/labels/good%20first%20issue) to start with. You can also [book a free, no-pressure pairing session](https://calendly.com/d/nw9f-6xfj/connector-development) with one of our core contributors.
+See our [Contributing guide](docs/contributing-to-airbyte/) on how to get started. Not sure where to start? We’ve listed some [good first issues](https://github.com/airbytehq/airbyte/labels/good%20first%20issue) to start with. If you have any questions, please open a draft PR or visit our [slack channel](slack.airbyte.io) where the core team can help answer your questions. 
 
 **Note that you are able to create connectors using the language you want, as Airbyte connections run as Docker containers.**