[CAM-11125] Add Nexus Repository links

Add a new section in https://docs.camunda.org/get-started/apache-maven/
The section could be named "Browse Camunda Nexus"
The new section shares the following two links that can be used to browse the Camunda Nexus artifacts:
- Community Edition: https://app.camunda.com/nexus/service/rest/repository/browse/camunda-bpm/
- Enterprise Edition: https://app.camunda.com/nexus/service/rest/repository/browse/camunda-bpm-ee/
In addition to the Enterprise Edition, the documentation should mention that the user is required to provide their handles

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camunda BPM