Partial rewrite of the page, mainly the last Kali TemplateVM section to:
- add missing steps in TemplateVM creation (ex: trimming to optimize disk space usage)
- correct inconsistent file names across subsections, which made the instruction nonfunctional "as-it"
- match shell commands with textual instructions
- remove unused, duplicate or wrongly formatted links /references
- enhance consistency in commands and style used within the same section
- enhance consistency in commands and style with other pages (ex: Qubes' Basics and Common Tasks, Fedora 23 to Fedora 24 upgrade, etc.)
- better follow Qubes Glossary and Documentation Guidelines
- have a hierarchical succession of headers / section titles
This commit merges the previous instructions for making a Kali VM (which
involved the katoolin scripts) with a new set of instructions that
involve solely a Debian 9.0 template.
