Update incubation guidelines#292

Draft

krassowski wants to merge 2 commits intojupyter:mainfrom

krassowski:incubation

Commits on Sep 22, 2025

Steering Council → Software Steering Council; no bower and Travis; any member of UoC would do
krassowski
authored

Commits on Dec 19, 2025

Merge branch 'main' into incubation (reflecting move to `docs/` subfolder)
krassowski
committed