Move space_robots from docker repo (space-ros/docker#256)

[mkhansenbot]

Moves the space_robots demo from the docker repo to this repo (demos). This is dependent on merging space-ros/docker#255 so that this container can pull the space-ros-moveit2 image

This fixes space-ros/docker#256

[mkhansenbot]

Per the discussion in the technical WG today, I will update the commit message to be more clear that it fixes the space-ros/docker#256 issue, and add additional comments that the history prior to this point is in the docker repo.

[mkhansenbot]

This is ready for review

The only caveat - it currently uses the "moveit2:main" image as a base. Once we release our next release (end of month) in the docker repo, a new image will be generated - "moveit2:latest" and this should be updated to use that image instead. I'll file an issue to track this, if this is approved.

[eholum]

Currently building and will sanity check!

In the interim... this is basically a straight copy paste right? In the past I've done something unholy when merging between repos and updating commit messages: space-ros/space-ros#167. I personally think that's overkill, but maybe it's worth updating the README.md to note that it was moved from a different repo? That would at least preserve the link between projects if there were some need to go back in time.

[eholum]

Side note, @EzraBrooks, can you update the repo settings to require approval before merging PRs? That merge button is just sitting there tempting me.

[eholum]

Did a quick sanity check and found the instructions to be a little off. I haven't been following demo evolution lately so maybe I'm missing something? In any case... would be good to at least tweak the readme so that these work out of the box.

On the plus side they do indeed work out of the box! So much faster to build and run these. Thanks for the work here, @mkhansenbot.

[EzraBrooks]

I apparently don't have access to this repo's settings. cc @gbiggs

[mkhansenbot]

Addressed @eholum review feedback, updating the README to use the new launch method of launching GUI and control separately

[eholum]

It does the thing! Thanks for the README updates it just worked out of the box for me.