documentation: Moved the detailed build section to concepts-manual.

documentation: Moved the detailed build section to concepts-manual.

The section that provides a closer look into the build system has
moved from the getting-started manaul to the concepts-manual.
I fixed all the links, provided some coded formatting of the
entire section, and made general updates.

The other manuals had links that needed fixed due to the move.

(From yocto-docs rev: b83a5619f56ebd9879fdcadcf474859e68b26d58)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>