Rajiv's 1st restructuring attempt

Ok, I changed the navigation around in addition to moving some of the content around.
I wouldn't leave this as one code block if you want to intro it here. I'd actually break it out component by component with a super short and simple explanation before hand. 

1. In order to send a message, you must first create a conversation. 
[code block]
2. Individual messages in a conversation can be made up of multiple pieces of content called MessageParts.  To send a simple plain text message, first create a part via the following. 
[Code block]
3. Messages are initialized with a conversation and an array of messages parts. 
[Code block]
4. Send the message