docs(reference-hw): add nebula

[drwnz]

Description

This PR adds links to the Nebula sensor driver to relevant supported reference hardware (Velodyne and Hesai).
This is the driver currently employed by default in Autoware Universe (see autowarefoundation/autoware#3699).

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[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware-documentation/pr-432/
Modified URLs:

• https://autowarefoundation.github.io/autoware-documentation/pr-432/reference-hw/full_drivers_list/
• https://autowarefoundation.github.io/autoware-documentation/pr-432/reference-hw/lidars/