fix image links

Author: tony

doc/_templates/book.html

@@ -7,5 +7,5 @@ <h3>Book Pre-order</h3>
 <p><a class="reference external" href="https://leanpub.com/the-tao-of-tmux/c/oBsI4y3o4quu">Pre-order on Leanpub</a> before Dec 23rd for the special discount
 price of $7.99.</p>
 <p>Read and browse the book for <a class="reference external" href="https://leanpub.com/the-tao-of-tmux/read">free on the web</a>.</p>
-<a class="reference external image-reference" href="https://www.amazon.com/gp/product/B01MG342KU/ref=as_li_tl?ie=UTF8&amp;camp=1789&amp;creative=9325&amp;creativeASIN=B01MG342KU&amp;linkCode=as2&amp;tag=gitpull-20&amp;linkId=e6d3f08ad92bfea1cf62d735b6a90bdf"><img alt="Amazon Kindle" src="/_static/img/books/amazon-logo.png" width="45%"></a>
-<a class="reference external image-reference" href="https://geo.itunes.apple.com/us/book/the-tao-of-tmux/id1168912720?mt=11&amp;at=1001lrwP"><img alt="iTunes" src="/_static/img/books/ibooks-logo.png" width="45%"></a>
+<a class="reference external image-reference" href="http://amzn.to/2gPfRhC"><img alt="Amazon Kindle" src="https://www.git-pull.com/_images/amazon-logo.png" width="45%"></a>
+<a class="reference external image-reference" href="https://geo.itunes.apple.com/us/book/the-tao-of-tmux/id1168912720?mt=11&amp;at=1001lrwP"><img alt="iTunes" src="https://www.git-pull.com/_images/ibooks-logo.png" width="45%"></a>