readme: refactor for clarity.

Author: paulirish

readme.md

@@ -6,7 +6,7 @@ diff-so-fancy builds on the good-lookin' output of diff-highlight to upgrade you
 
 ## Screenshot
 
-*diff-highlight (default) vs diff-so-fancy*
+*`git diff` vs `git diff | diff-so-fancy`*
 
 ![diff-highlight vs diff-so-fancy](https://cloud.githubusercontent.com/assets/39191/10000682/8e849130-6052-11e5-9bd9-bd4505cd24d6.png)
 
@@ -23,30 +23,34 @@ git config --global core.pager "diff-highlight | diff-so-fancy | less -r"
 
 ## Install
 
-GNU sed. On Mac, install it with Homebrew:
 ```shell
-brew install gnu-sed --with-default-names  # You'll have to change below to `gsed` otherwise
+npm install -g diff-so-fancy
 ```
+This will install and link the `diff-so-fancy` and `diff-highlight` scripts.
 
-diff-highlight. It's shipped with Git, but probably not in your `$PATH`:
+### GNU sed. 
+On Mac, install it with Homebrew.
 ```shell
-ln -sf "$(brew --prefix)/share/git-core/contrib/diff-highlight/diff-highlight" ~/bin/diff-highlight
+brew install gnu-sed --with-default-names  # You'll have to change below to `gsed` otherwise
 ```
 
-Add some coloring to your .gitconfig:
+### Git config color
 ```
 git config --global color.diff-highlight.oldNormal "red bold"
 git config --global color.diff-highlight.oldHighlight "red bold 52"
 git config --global color.diff-highlight.newNormal "green bold"
 git config --global color.diff-highlight.newHighlight "green bold 22"
 ```
+You may also want to configure [general diff colors](https://github.com/paulirish/dotfiles/blob/63cb8193b0e66cf80ab6332477f1f52c7fbb9311/.gitconfig#L23-L36).
 
-### npm
-
+### `diff-highlight` 
+It's installed via the `diff-so-fancy` npm package. But it's also shipped with Git so, if you prefer, you can add it to your `$PATH` manually:
 ```shell
-npm install -g diff-so-fancy
+ln -sf "$(brew --prefix)/share/git-core/contrib/diff-highlight/diff-highlight" ~/bin/diff-highlight
+# confirm that ~/bin is in your PATH
 ```
 
+
 ## Credit
 
 Extracted from https://github.com/paulirish/dotfiles/blob/master/bin/diff-so-fancy