rearrange the filepath of examples

[hsj576]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
The filepath of examples need to be rearranged.

Which issue(s) this PR fixes:

Fixes #

[MooreZheng]

It's good to see a rearrangement on the file path. This work would make the example much more user-friendly.

As discussed in the routine meeting:

1. A readme might be needed to set up and clarify the rule. The naming of directories would be in the manner of Dataset/ Scheme/ Task.
2. Works from the robotic dataset by Shijing, Linjie, and Tianyu, would be merged into a unified directory.
3. The simulation work has nothing to do with building simulation, the title of which should be re-named to "how to run simulation" and re-located to ianvs/docs/guides.

[hsj576]

It's good to see a rearrangement on the file path. This work would make the example much more user-friendly.

As discussed in the routine meeting:

1. A readme might be needed to set up and clarify the rule. The naming of directories would be in the manner of Dataset/ Scheme/ Task.
2. Works from the robotic dataset by Shijing, Linjie, and Tianyu, would be merged into a unified directory.
3. The simulation work has nothing to do with building simulation, the title of which should be re-named to "how to run simulation" and re-located to ianvs/docs/guides.

The examples are rearranged according to the discussion in the routine meeting.

[MooreZheng]

/lgtm

[jaypume]

/lgtm