Publish artifacts on OW2 Nexus repository

Use OW2 Nexus repository instead of doing SFTP to weblab-project.org.
Remove reference to weblab-project.org (site, organization, etc.).
1 job for use-ow2-nexus in 20 seconds (queued for 10 seconds)
Status Name Job ID Coverage
  Build
passed build_job #49823

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