restructure docs

Author: vgvoleg

docs/ydb.rst renamed to docs/apireference.rst

@@ -1,5 +1,5 @@
-ydb
-===
+YDB API Reference
+=================
 
 .. toctree::
    :caption: Contents:

docs/index.rst

@@ -7,11 +7,11 @@ YDB Python SDK
 ===============================
 
 .. toctree::
-   :maxdepth: 4
+   :maxdepth: 3
 
    overview
-   ydb.rst
-   examples.rst
+   examples
+   apireference
 
 
 Indices and tables

docs/overview.rst

@@ -1,5 +1,8 @@
+Overview
+========
+
 Project Homepage
-================
+----------------
 
 YDB Python SDK is hosted on GitHub at https://github.com/ydb-platform/ydb-python-sdk under the ydb-platform organization.
 
@@ -8,10 +11,10 @@ Releases and project status are available on Pypi at https://pypi.org/project/yd
 The most recent published version of this documentation should be at https://ydb-platform.github.io/ydb-python-sdk.
 
 Installation
-============
+------------
 
 Prerequisites
--------------
+^^^^^^^^^^^^^
 
 * Python 3.8 or higher;
 * ``pip`` version 9.0.1 or higher;
@@ -28,14 +31,14 @@ If you cannot upgrade `pip` due to a system-owned installation, you can run the
     python -m pip install --upgrade pip
 
 Installation via Pypi
----------------------
+^^^^^^^^^^^^^^^^^^^^^
 
 To install YDB Python SDK through Pypi execute the following command::
 
     pip install ydb
 
 Community
-=========
+---------
 
 You can ask your questions in official Telegram chats: