WIP: Add introductory comments

Closes none

What does this MR do?

comments, short to long option changes in scripts, devdocs small improvements

remove WIP when devdocs are more changed

How confident are you it won't break things if deployed?

totally, does not change functionality/ code

Links to related issues

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))