[Main] Clarify vague points in documentation

[Pante]

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This pull request clarifies a few vague points in the current documentation.

Firstly, it expands on how to configure a base-package in the Getting Started section. This is currently only vaguely alluded to in the Config Key section.

Secondly, under the logging section, it adds a link to the Maven Configuration guide which elaborates on how to turn off logging without having to specify the option in the CLI each time.

[hbelmiro]

Thank you for this contribution @Pante.

[hbelmiro]

@all-contributors add @Pante for docs.

[allcontributors]

@hbelmiro

I've put up a pull request to add @Pante! 🎉