Add a new section: Colophon

Remove the "creating a mountable disk" section from "Advanced"

Add a "Troubleshooting/FAQs" section

Simplify the concept of the 'clone a physical disk' section

Minor syntax/indentation fixes

Separate Disk Component Descriptions from Access Modes section (Closes #25)

Un-title more footnotes, re: #20

Add some stronger (i.e., canonical) sources for some footnotes in the
disk drive section
Remove the bitmap header from the disk components png/svg. Add more information to the colophon.