Finalize online help adaptions
While removing plugins from the main product, the respective help content has been removed. In this ticket, the following should be performed:
- Adjust layout of getting_started.html (remove placeholders)
- Update model_markers_view.html (and integrate somewhere else)
- Scan documentation from remaining links or indirect references
(from redmine: issue id 3866, created on 2019-11-05, closed on 2020-04-06)
- Relations:
- child #3947 (closed)
- child #3948 (closed)
- child #3949 (closed)
- child #3950 (closed)
- child #3951 (closed)
- parent #3860 (closed)