Update README.md and remove internl doc links

ISSUE=4586877

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1421 1ad973e4-5ce8-4261-8a94-b56d1f490c56

README.md

 # PaddlePaddle
 
-[![Documentation Status](https://readthedocs.org/projects/ctcspeechrecognition/badge/?version=latest)](http://ctcspeechrecognition.readthedocs.io/en/latest/?badge=latest)
-
 PaddlePaddle (PArallel Distributed Deep LEarning) is an easy-to-use,
 efficient, flexible and scalable deep learning platform, which is originally
 developed by Baidu scientists and engineers for the purpose of applying deep
@@ -46,33 +44,34 @@ learning to many products at Baidu.
   the capability of PaddlePaddle to make a huge impact for your product.
 
 ## Installation
-See [installation guide]() to build and install from the source code or install
-the Docker Image.
+See [Installation Guide](http://paddlepaddle.org/doc/build/) to install from pre-built package or build from the source code.
 
 ## Documentation
-- [Quick Start]() <br>
+- [Chinese Documentation](http://paddlepaddle.org/doc_cn/) <br>
+
+- [Quick Start](http://paddlepaddle.org/doc/demo/quick_start/) <br>
    You can follow the quick start tutorial to learn how use PaddlePaddle
    step-by-step.
     
-- [Example and Demo]() <br>
+- [Example and Demo](http://paddlepaddle.org/doc/demo/) <br>
    We provide five demos, including: image classification, sentiment analysis,
    sequence to sequence model, recommendation, semantic role labelling. 
    
-- [Distributed Training]() <br>
+- [Distributed Training](http://paddlepaddle.org/doc/cluster) <br>
   This system supports training deep learning models on multiple machines
   with data parallelism.
    
-- [Python API]() <br>
+- [Python API](http://paddlepaddle.org/doc/ui/) <br>
    PaddlePaddle supports using either Python interface or C++ to build your
    system. We also use SWIG to wrap C++ source code to create a user friendly
    interface for Python. You can also use SWIG to create interface for your
    favorite programming language.
  
-- [How to Contribute]() <br>
-   We sincerely appreciate your interest and contributions. If you’d like to
+- [How to Contribute](http://paddlepaddle.org/doc/build/contribute_to_paddle.html) <br>
+   We sincerely appreciate your interest and contributions. If you would like to
    contribute, please read the contribution guide.   
 
-- [Source Code Documents]() <br>
+- [Source Code Documents](http://paddlepaddle.org/doc/source/) <br>
 
 ## Ask Questions
 

doc/build/index.rst

@@ -18,7 +18,6 @@ If you want to hack and contribute PaddlePaddle source code, following guides ca
     :glob:
 
     build_from_source.md
-    internal/contribute_code.md
     contribute_to_paddle.md
 
 Build Docker Images

doc/cluster/index.rst

@@ -4,5 +4,4 @@ Cluster Train
 .. toctree::
   :glob:
 
-  internal/index.md
   opensource/cluster_train.md

doc_cn/ui/index.rst

@@ -13,7 +13,7 @@ TBD
 API参考
 =======
 
-TBD
+`Trainer Config Helper <http://paddlepaddle.org/doc/ui/api/trainer_config_helpers/index.html>`_
 
 命令行参数
 ==========