Codebase is cleaned up!

[greenw0lf]

Closes #88

[jblom]

@greenw0lf ok looks good:

• tests run ok
• Dockerfile builds nicely

Just did a small edit in docker-compose.yml (change name of image/container)

Also changed the kaldi-nl-test data into whisper-test (also made sure that file is available on modelhosting.beng.nl