Rewrite some bits of Debian image's "How It's Made" to clarify
Rewrite some bits of Debian image's "How It's Made" to clarify

Per some feedback from Holger [1], I took the opportunity to rewrite/rephrase some of this to try and make it more clear how to reproduce the Debian tarballs with the `debuerreotype` tool, specifically around where to look to get the information required (timestamp, etc) to do so.

[1]: https://lists.reproducible-builds.org/pipermail/rb-general/2020-January/001779.html

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