[README] How to Use Discussions and Get Support 👈🏽

[tacastillo]

Hey folks!

As we've recently (10/30/23) announced on Slack, we are moving to GitHub Discussions as the primary platform for Dagster support.

If you have any questions on how to Dagster or how to best use it, you're welcome to search through our existing GitHub Discussions and make your own Discussion if you haven't found a relevant existing discussion for your question.

For more details on how to best receive support, please refer to our docs on Getting Help.

Thanks for using Dagster!