D-book: start directly from D-thinker

[zma]

(12-04-2014 01:12 PM)YU_Xinjie Wrote:  It seems your recent commit on rc of d-book delete the large_scale_distributed_systems.md, rather than move it into the appendix dir. It leads to an invalid link in the SUMMARY.md

<code>
commit f3f8bb942f969139d8b7157b7aa9d1b6ed597cc4
Author: Eric Zhiqiang Ma <zma@ericzma.com>
Date: Wed Dec 3 17:45:15 2014 +0800

move intro to other tech to appendix in d-book
</code>

Oops.. Just added them back.