Remove Maven Local Repository

[mhellmeier]

Current Problem

In order to build and run the CLI tool or the webinterface, the watermarker library has to be built locally and published to maven local.

Proposed Solution

It should be checked whether it makes sense to publish the watermarker library directly (in GitHub, Docker Hub, etc.) to make it directly usable without an additional build and publish step.

Additional Context

After the watermarker library is published, the mavenLocal() repository can be removed from the CLI tool and the webinterface.