Several documentation enhancements and build warnings fixes

- Made the documentation even more friendly towards newbies.
- Eased the usage of methods like get history which now set
  a default empty message for message actions and vice versa.
- Fixed some docstring documentations too.
- Updated the old normal docs/ to link back and forth RTD.
- Fixed the version of the documentation, now auto-loaded.

readthedocs/extra/basic/creating-a-client.rst

@@ -93,6 +93,8 @@ method also accepts a ``phone=`` and ``bot_token`` parameters.
 You can use either, as both will work. Determining which
 is just a matter of taste, and how much control you need.
 
+Remember that you can get yourself at any time with ``client.get_me()``.
+
 
 .. note::
     If you want to use a **proxy**, you have to `install PySocks`__