Create converter script for unified sections and Vim folds.

[ypid]

Implements: #156

I plan to do this in Python3. The script should be idempotent and update defaults/mail.yml to the latest docs standards. Script name: yaml4rst. ~~ETA maybe 1 week from now (got distracted by the DebOps API).~~ → It is done when it is done

~/.local/share/debops/debops-playbooks/roles:
$ find . -iwholename '.*defaults/main.yml' | xargs cat  | wc -l
24838

Good luck doing that manually :wink:

[ypid]

Done: https://github.com/ypid/yaml4rst