Add a better image of AS-501 on the pad

Source: http://www.hq.nasa.gov/office/pao/History/alsj/a410/ap4-S67-43593HR.jpg

The image in the book is an aerial shot, but I can't find it.
Add a better image of the AS-201 launch

Source: http://www.hq.nasa.gov/office/pao/History/alsj/misc/apmisc-KSC-66PC-22HR.jpg

This isn't the exact same shot as in the book, but it's far better.