Remove screenshots from README

Skitch either doesn't have them anymore or they're under some new
URL. Either way, remove these broken links.

Author: carlosmn

README.md

@@ -57,21 +57,6 @@ Docurium will write your docs directly into the specified Git branch.
 
     $ gem install docurium
 
-# Screenshots
-
-## Main Page
-
-![Main Page](https://img.skitch.com/20110614-c98pp6c9p9mn35jn4iskjim7hk.png)
-
-Each version of your app has a landing page that lists out all the functions available.  Functions that are new in that version from the previous version are highlighted in green, functions that have changed signatures are in orange.
-
-## Function Page
-
-![Func Page](https://img.skitch.com/20110614-mdasyhip3swxtngwxrce8wqy3h.png)
-
-Each function has a page showing all the relevant info for that function including metadata extracted from Doxygen-style comments.  I also list all the versions of the library that this function is included in and in which versions the signature changed.
-
-
 # Contributing
 
 If you want to fix or change something, please fork on GitHub, push your change to a branch named after your change and send me a pull request.