In the readme of optaplanner, optaweb-*, optaplanner-quikstarts and optaplanner-website we link to very stale information: https://github.com/kiegroup/optaplanner#developing-drools-optaplanner-and-jbpm

Less is more. Let's bring that down the absolute bare minimum, to attract contributors. *What do new contributors need to know? *I'd argue:

• Code style is enforced by build - setting up IDE is optional.
• Tests run in less than 10 minutes, but CI on PR's will do it for you anyway.
• Use of -Dquickly?
• how to build the docs.

Let's change the title of this section to "Contributing to OptaPlanner".

https://docs.google.com/document/d/1txmx8xMq0Z0AYb53FikbvB6-A2eS0eMkczcdDxUgemY/edit?usp=sharing