* Update build_and_install_lib_cn.rst

* Update build_and_install_lib_cn.rst

test=release/0.15.0

* fix docs dead links for 0.15.0

* Update README.cn.md

* Update visualdl.md

test=release/0.15.0

* Add new_doc to develop branch

* Add pics of Anakin tutorial

* Update anakin_tutorial.md

* Delete anakin_fm_en.png

* Delete contri1.JPG

* Delete contri2.JPG

* Update build_and_install_lib_cn.rst

* Update compile_paddle_lib_cn.md

* Update compile_paddle_lib_en.md

* Update install_doc.rst

* Update install_doc.rst