debian: updated README.md
baseimage: updated README.md
debian: updated README.md
baseimage: updated README.md
debian: updated README.md
baseimage: updated README.md
baseimage: updated README.md
debian: updated README.md
baseimage: updated README.md
baseimage: use `sed -i -e ...` instead of `perl -pi -e ...` to edit config files

perl package is still installed (because git package depends on perl)
Merge branch 'feature/use-sed' into feature/run-apt-at-a-time

Conflicts:
	baseimage/build/scripts/01-setup