Adjust catalog for documentation.

ISSUE=4603671

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1456 1ad973e4-5ce8-4261-8a94-b56d1f490c56

Author: qingqing01

doc/algorithm/rnn/bi_lstm.jpg

@@ -0,0 +1 @@
+../../demo/sentiment_analysis/bi_lstm.jpg

doc/algorithm/rnn/encoder-decoder-attention-model.png

@@ -0,0 +1 @@
+../../demo/text_generation/encoder-decoder-attention-model.png

doc/ui/api/rnn/index.rst renamed to doc/algorithm/rnn/index.rst

@@ -1,4 +1,4 @@
-# PaddlePaddle Quick Start Tutorial
+# Quick Start Tutorial
 
 This tutorial will teach the basics of deep learning (DL), including how to implement many different models in PaddlePaddle. You will learn how to:
   - Prepare data into the standardized format that PaddlePaddle accepts.

doc/demo/quick_start/index_en.md

@@ -0,0 +1,7 @@
+Writing New Layers
+==================
+
+.. toctree::
+  :maxdepth: 3
+
+  new_layer.rst

doc/demo/new_layer/FullyConnected.jpg renamed to doc/dev/new_layer/FullyConnected.jpg

@@ -7,8 +7,16 @@ User Guide
 * [Build and Installation](build/index.rst)
 * [Contribute Code](build/contribute_to_paddle.md)
 * [User Interface](ui/index.md)
-* [Source Code Documents](source/index.md)
-* [Layer Documents](layer.md)
-* [Trainer Config Helpers](ui/api/trainer_config_helpers/index.md)
+* [Model Config Interface](ui/api/trainer_config_helpers/index.md)
 * [Example and Demo](demo/index.md)
 * [Cluster Train](cluster/index.md)
+
+Development Guide
+-----------------
+* [Layer Documents](layer.md)
+* [Writing New Layers](dev/new_layer/index.rst)
+* [Source Code Documents](source/index.md)
+
+Algorithm Tutorial
+------------------
+* [RNN Configuration](algorithm/rnn/rnn.rst)