README.md: remove "Quick Emacs rundown" section

The mode requires somewhat involved initial setup with configuring
indentation-hooks (not to mention even using Melpa requires first
adding it to `package-archives'), so as it stands it doesn't really
target people who doesn't even know what an init file is. That chapter
of README isn't really useful IMO, let's just remove it.

Author: Hi-Angel

README.md

@@ -3,17 +3,6 @@
 
 This Emacs package provides indentation, syntax highlighting, and other facilities for PureScript language.
 
-Quick Emacs rundown
---------------------
-
-When Emacs is started up, it normally loads the
-[Emacs initialization file](http://www.gnu.org/software/emacs/manual/html_node/emacs/Init-File.html)
-usually called `~/.emacs`, `~/.emacs.el`, or `~/.emacs.d/init.el`;
-with `~` standing for for your home directory.  This file should
-contain all of your personal customisations written as a series of
-Emacs Lisp commands.  In the following sections, this file will simply
-be referred to as the `.emacs` file.
-
 Installation
 ------------