How to properly launch baritone from dev environment

## What do you need help with?
I cloned the repository and followed the steps in SETUP.md under the Intellij section. After running the genIntellijRuns Gradle task a Minecraft Client run configuration is created. However, when I follow the instructions in SETUP.md and attempt to run it I get "Error: Could not find or load main class GradleStart." If I change the module to baritone.main I get an error that states "java.lang.ClassNotFoundException: baritone.launch.BaritoneTweaker" Through experimentation, I discovered that the runClient Gradle task works properly however I don't believe it is possible to attach a Minecraft account using --username and --password as I have done in other projects. (If this even works post-migration.) What should I be doing?

## Final checklist
- [x] I know how to properly use check boxes
- [x] I have not used any OwO's or UwU's in this issue.

Start with the IntelliJ section of SETUP.md and reproduce the genIntellijRuns-created Minecraft Client configuration, noting the GradleStart and BaritoneTweaker errors. Compare that configuration with the working runClient Gradle task and document or correct the supported way to launch the client and handle account arguments.

Written by the indexing model from the issue text.