Update "Surf Classes & Surf Molec" tut for CB 1.0

Updated images and text for the "Surface Classes and Surface Molecules" so that
it is consistent with the changes in CB 1.0. Fixed some typos and broke up some
large blocks of text so it's easier to follow.

We should maybe consider merging this tutorial with "Introduction to Surface
Classes" or breaking that one up into two sections ("Surface Classes and Volume
Molecules" and "Surface Classes and Reactions").
Smaller sub-TOCs. Fixed typo. Updated intro.

I changed the max-depth of the table of contents for the "Advanced
Models" and "Advanced Features", so that they are a little easier to
parse (and hopefully less intimidating).

The introductory paragraph was updated to reflect some of the changes
that were made to the other tutorials (i.e. they are no longer dependent
on the "Getting Started" tutorial).
Update the "Var Rate Constant" tutorial for CB 1.0
Removed old commented out text.

Removed commented out text about old project files.

Fixed a section that was awkwardly worded and moved another section
around.
Added some images to the CB install section.