docs: emphasize that the code must be under version control (cf #348)
docs: emphasize that the code must be under version control (cf #348)

babsey/sumatra,apdavison/sumatra,apdavison/sumatra,apdavison/sumatra,babsey/sumatra,open-research/sumatra,babsey/sumatra,babsey/sumatra,apdavison/sumatra,open-research/sumatra,babsey/sumatra,open-research/sumatra,open-research/sumatra,open-research/sumatra,apdavison/sumatra