Add the image of Saturn V on the pad from page ii

Source: https://ia600308.us.archive.org/6/items/stagestosaturnte00bilsrich/stagestosaturnte00bilsrich_raw_jp2.zip
Add a better image of Saturn V on the pad

Source: http://spaceflight.nasa.gov/gallery/images/apollo/apollo4/html/s67-50530.html
Add page ii to EPUB
Fix some layout-affecting markup errors in the index
Fix broken/incorrect links in the index

There are probably many more incorrect links which need manual
checking to find.
Clean up the markup of the index
Fix index links to parts
Fix index links to illustrations

Where no (relevant) image was found, the link was removed.
Add the index to EPUB