Improve doc for scaffold package readme command

[ernilambar]

Bug Report

• [x] Yes, I reviewed the contribution guidelines.
• [x] Yes, more specifically, I reviewed the guidelines on how to write clear bug reports.

Describe the current, buggy behavior

"support": {
  "body": "https://raw.githubusercontent.com/runcommand/runcommand-theme/master/bin/readme-partials/support-open-source.md"
},

Similar to body, our code also supports pre and post. But it is not mentioned anywhere in the documentation. Are those for internal purpose only? If those are supposed to be used publicly then it is good to be mentioned in the doc.

[danielbachhuber]

We can mention them in the docs 👍