remove trailing whitespace

start work on mentioning bookworm release

remove obituaries out of section 'Important Events'
rename 'Important Events' to 'Some Important Events'
file obituaries under new section 'Remembering People We have Lost'

todo: Message-ID: <CAD+GYvwowzuZMXhLUw7q8Xx1SiXHv3vq2T4gdROrDzVa_LQUSw@mail.gmail.com> @ debian-private

todo: ask for review?