Add RViz Marker DisplayTypes Tutorial (backport #4821) #4871
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This PR is a continuation of the initial issue #3864, the discussion in the abandoned PR #3908 which led to the first completed PR #4040 of the porting of old RViz tutorial series.
This is the next tutorial about RViz and especially RViz Marker Types, which is the basis for the following tutorial series I want to port in later PRs as soon as this one is ready because I have some time now.
The link to the original Marker DisplayTypes Tutorial in ROS1 which served as a basis.
In the old RViz documentation page the DisplayTypes: Marker was grouped with the other DisplayTypes on a subpage. In contrast, I decided to keep it on the main RViz subpage for this version, as I do not intend to add new PRs for the other DisplayTypes in the near future. I want to finish the current tutorial series first. I do not think we need a subpage for the Marker DisplayTypes page until we have more than one other DisplayType Page, and I think this page still fits nicely into the main RViz page at the moment, but I am interested in your opinion.
I think this version is ready for your next review step (as it had one or two review steps in #3908)
This is an automatic backport of pull request #4821 done by Mergify.