[BUG]Onboarding new developers

[prasadtalasila]

Describe the bug

New developers need to have lower threshold on boarding process. The current help documentation is not sufficient

Expectation

1. A step-by-step tutorial for developers to get started in the project.
2. Consolidated configuration page to clear potential confusion.

This documentation must go into docs/developer directory

[prasadtalasila]

Suggestions from @Microchesst to improve the onboarding:

1. Make devContainers the default development environment and remove the development scripts (especially since the Windows scripts aren't working)
2. One or two Markdowns containing step-by-step tutorials to see the fully functional DTaaS and parts of the app (client / libms / runner etc). May be a recorded video will help.