Move Wagtail from Blogging to CMS

Wagtail is a CMS, not just a blogging platform, thought it would be good to move it to a more appropriate spot. Also, updated the Github URL has it has changed.

README.md

@@ -174,7 +174,6 @@ See also [Static Site Generators](#static-site-generators), [Content Management
   * [PluXml](http://www.pluxml.org/) - XML-based blog/CMS platform. ([Source Code](https://github.com/pluxml/PluXml)) `GPL` `PHP`
   * [Postleaf](https://www.postleaf.org/) - An open source blogging platform with inline editing, handlebar templates, and a beautiful user interface. ([Source Code](https://github.com/Postleaf/postleaf)) `MIT` `Nodejs`
   * [Solo](http://b3log.org/) - A blogging system written in Java, feel free to create your or your team own blog. ([Demo](http://88250.b3log.org/), [Source Code](https://github.com/b3log/solo)) `Apache` `Java`
-  * [Wagtail](https://wagtail.io/) - A Django content management system focused on flexibility and user experience. ([Source Code](https://github.com/torchbox/wagtail)) `BSD` `Python`
   * [WordPress](https://wordpress.org/) - Create a beautiful website or blog. ([Source Code](https://github.com/WordPress/WordPress)) `GPLv2` `PHP`
 
 
@@ -484,6 +483,7 @@ CMS are a practical way to setup a website with many features. CMS often come wi
   * [Textpattern](http://textpattern.com/) - A flexible, elegant and easy-to-use CMS. ([Demo](http://textpattern.co/demo), [Source Code](https://github.com/textpattern/textpattern)) `GPLv2` `PHP`
   * [TYPO3](https://typo3.org/) - A powerful and advanced CMS with a large community. ([Source Code](https://github.com/TYPO3/TYPO3.CMS)) `GPLv2` `PHP`
   * [Umbraco](https://umbraco.com/) - The friendly CMS. Free and open source with an amazing community. ([Source Code](https://github.com/umbraco/Umbraco-CMS)) `MIT` `.NET`
+  * [Wagtail](https://wagtail.io/) - A Django content management system focused on flexibility and user experience. ([Source Code](https://github.com/wagtail/wagtail)) `BSD` `Python`
   * [WonderCMS](http://www.wondercms.com) - WonderCMS is the smallest flat file CMS since 2008. ([Demo](https://www.wondercms.com/demo), [Source Code](https://github.com/robiso/wondercms)) `MIT` `PHP`
   * [WordPress](https://wordpress.org/) - The worlds most-used blogging and CMS engine. ([Source Code](https://github.com/WordPress/WordPress)) `GPLv2` `PHP`