Provide a lab workspace to run applications

[chuck-confluent]

Depending on what code maintainers or participants will be expected to run, it would be good to include a preconfigured workspace for the repo via gitpod. I'll list a few example use cases where a 0-setup, 1-click workspace would be convenient.

For lab participants:

• run kafka producer/consumer/streams applications
• run any front-end or other client applications against infrastructure created in the lab
• run terraform to create/destroy cloud resources

For repo maintainers:

• use hugo to update the static website
• write/test scripts in a sandbox without having to change the configuration of our own laptops