fix docker build using cdn url

Update install_doc.md

update docker images source to baidubce

Cherry-pic fix the docs pics to 0.14.0

fix_bookdoc_0.14.0

renew install_doc

fix typo and image in fit_a_line

update inference_doc in release/0.14.0

Revert "latest install doc"

Fix flowers dataset download problem

This reverts commit cb92d4e2.

* latest install doc

* latest install doc

* Rename install_doc.rst to install_doc.md

* add install_doc.md to path

* Fix flowers dataset download problem

* Update the build script to account for the latest PPO.

* Update paddle_build.sh

* Update paddle_build.sh

* Simply modify beginners_guide/basics/image_classification/index.md
to have the $math$ format instead of `$math$`

* Update the rest of the documentation to move away from `$$` format

update website to point to 0.14.0 release whl

* Add pics of Anakin tutorial

* Update anakin_tutorial.md

* Delete anakin_fm_en.png

* Delete contri1.JPG

* Delete contri2.JPG