add a rough article about tires

Still mostly raw content from the files section of the yahoo group
update using content from the tire thread PDF

The PDF has newer content than the text file.
rearrange tire article to put all info for each brand in one place

In the PDF there are often two sections for each brand.  Not sure why.
add a dynamic table of contents to the tire article
linkify links to tire vendor websites
reformat <pre> text in tire article so it wraps cleanly
move alert block on tire page to emphasize it
add scroll-spy body attributes to the tire article
add popup page history and credit to Cris Vande Velde to tire article
add link to tire article