feat: part2 lab2 done, TODO part3

.gitignore

content/01_labo1_macflooding.md

content/02_labo_stp.md

figs/gns3_path_to_root_from_s2.png

figs/h1-h2_fail_topology-change.png

figs/h1-h2_fail_topology-change_annotated.png

figs/s2_route_to_root.png

figs/s2_route_to_root_annotated.png

figs/wireshark_topology_change.png

figs/yersinia_list_attacks.png

figs/yersinia_ui.png