Implement single binary single docker-image single configuration file

[sir-hassan]

Summery

We decided to have a single binary/docker-image (or as fewer as possible) for all our go backend applications in repo direktiv/direktiv. This will simplify the building and development process.

I would suggest to implement it in two steps:

• step1: change to single binary. This will require only minor changes in /cmd directory.
• step2: change to a single docker image. This will require changing docker files plus helm charts.
• step3: change to a single configuration file.
• step4: clean up code, package renaming and project cleanup.