* Add fluid.md

* in response to comments from Tony and Abhinav

* add support new device doc

* add more info

* first commit

* Update read_source.md

* fix the ending symbol

* fix invalid content link

* update docs about how to add a new operator

* write versino.py

* add version py

* clean init py

* add istaged, major and etc... fields

* update

* update

* update

This pull request adds "Build using Docker" documentation to the "Getting Started > Install and Build" menu on PaddlePaddle.org

Change the instructions to use https instead of SSH

* add doc config for fluid

* fix typo

* follow comments

* Translate the CPU profiling document

* Paragraphing

* Add survey of support of half in different CUDA versions

* small fix

* refine install docs

* do not remove files

* follow comments

* update

Update the write_docs_en.rst and write_docs_cn.rst to include how to run the documentation viewer tool without Docker
Add dev/contribute_to_paddle_cn.md onto navigation link