Organize Social Media Playbook

A lot of the writing was already logically grouped between 'Racker Values' and 'Hard and Fast Rules', yet was not physically grouped.

The *TL;DR* was removed, as bullet points/numbered lists are the substitute for the section.
Grammer Formatting and More Organization

- Tried to remove as many parentheticals as possible.
- Replaced slash delimited words with 'or'.
- Switch bolded inline statements to italics.
- Moved some subpoints to main points (such as 'Helping others').
Fix numbering and broken formatting.
Merge pull request #2 from bramwelt/master

Organize into 'Hard and Fast Rules' and 'Racker Values' Groups