#15861 Update documentation on dockerized SUMO

[Menkalian]

I updated the developer documentation on Docker and added a tutorial on the basic usage in docker (and fixed a unsatsified link error occurring in the container).

I tried to get an example with a GUI working, but I did not get it to work reproducible.

I hope I managed to hit the right tone for the docs.

closes #15861

[Menkalian]

@uekerman FYI

[Menkalian]

I found a small issue in the docker image, that prevented sumo from executing. The new commit fixes that.

[behrisch]

@Menkalian Thanks a lot! Instead of mangling with the ld path, I think it might be easier to install jupedsim directly into the system since we are dockerized anyway. What do you think?

[Menkalian]

@Menkalian Thanks a lot! Instead of mangling with the ld path, I think it might be easier to install jupedsim directly into the system since we are dockerized anyway. What do you think?

@behrisch Yeah, that's probably more the "docker" way. I was not sure if there was a specific reason for keeping a separate install directory, but it might just be a remnant from some previous work.

I will take a look at it.

If I find any further improvements for the docker image (e.g. smaller size, adding some meta information, checking with best practices, ...), would you prefer for me to add it in this PR or open a separate issue and PR? I'm fine with either way.

[Menkalian]

I have now adapted the whole Dockerfile, so the resulting image is smaller (instead of 8.5 GB it's now around 4.2 GB), contains Metadata and has jupedsim installed in the system environment.