Add documentation step

Create "dummy" step which just embeds links to documentation.

Usage:

* Doc: "Temporarily configuring a network device to accept all traffic using iproute2"

There are some sections under team and bond chapters with the same names, distinguish them by scenario tags (might be adjusted when we actually cover that sections).

The list of sections is just parsed from HTML (and merged RHEL8 and RHEL9-beta verstions), so some of the generated links might not be valid, and some of them might not be coverable (just a plaintext section without code), we can filter them out later, if there will be a need to do so.