Update the colophon a bit

Troubleshooting:
- Fix the interrobang not rendering correctly in QandASets
- Add more troubleshootable things

General:
- Mess with some formatting in the character code/caret notation section
- Move a lot of <footnote>s out of <note>s
- Move link text out of the label for footnotes so the urls's are
  printed in print format
- Ellipsis are now represented with the correct unicode character
- Fix some "quoted" things that should have been <quote>d
- Finished example 2.2 (Closes #30)
- Cross references now print section number and titles