Clean Local environment documentation

[damagode]

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Documentation bug, improvement

I have started the application using boost start -e local and I didn't know how to clean the local data.

Description

I was doing some changes in the Entities and Events so I needed to clean the local data to accommodate the new changes. Finally, talking with one of the Booster members I discovered that the application creates a .booster folder with the information on it. So cleaning that folder will reset the local environment.

I think this could be a common use case that might need to be added to the documentation to improve the user experience.