bash directory in the root is opinionated

[apolopena]

Describe the bug

This starter assumes a user will never have a bash directory of their own in the root of the project.
Users should be able to have a bash folder of their own if they want

Additional information

• Put the bash folder in a .gp folder.
• Moving as many Gitpod related files into the .gp folder as possible will make this starter less opinionated.
• .gitpod.yml and .gitpod.Dockerfile will need to stay in the project root.
• This is a pretty large refactor.