Add test topology
Add plays that run test topology, inspect, and destroy when finished
Delete unused groups gap_repos and kvm
Update README.md

Remove dev_images role as we'll pull these from a docker repository instead of building them each time
Strip ContainerLab role from any tasks that don't actually install ContainerLab
Add Docker role that installs docker onto a machine
Update inventory file to include a sample cl machine in the lab
Update playbook to only install Docker and ContainerLab by applying the appropriate roles

Gap repos

See merge request !1

As "update apt cache", it did not match the handler name ("Update apt cache"). The first ansible run failed (https://devops.stackexchange.com/questions/4365/ansible-handler-not-found-on-first-attempt)

(https://containerlab.dev/manual/topo-def-file/#kinds)

This reverts commit 4073073e.