Revise the label structure in ASAM Project

[florianwallerer]

When the following issue OpenDRIVE #232 has been successfully implemented in the OpenDRIVE project, the pages in the project guide must be updated:

• https://asam-ev.github.io/asam-project-guide/asamprojectguide/latest/contributing/contribution_workflow.html#_workflow_overview

• https://asam-ev.github.io/asam-project-guide/asamprojectguide/latest/compendium/Guidelines/repo-issue_and_mr_labels.html#_status_labels

• https://asam-ev.github.io/asam-project-guide/asamprojectguide/latest/compendium/Guidelines/workflow-ticket_triage.html

• Should each issue get an isType: label ? Therefore we need more isType: labels -> Topic is onhold

[florianwallerer]

All three sites have been updated. There is still some polishing missing, but this will be adressed, if the freeze of the project guide is gone.