remove gallery3

unmaintained as per http://galleryproject.org/
#381

README.md

@@ -717,7 +717,6 @@ See https://github.com/n1trux/awesome-sysadmin#monitoring and https://github.com
 ## Photo and Video Galleries
 
   * [CumulusClips](http://cumulusclips.org/) - Your own video sharing website with CumulusClips video sharing script. You can build a YouTube clone where users can upload, rate, comment on videos, and much more.  `GPLv2` `PHP` ([Demo](https://tube.devosi.org/))
-  * [Gallery](http://galleryproject.org/) - The simplest, most intuitive way to host your photos on your website. ([Source Code](https://github.com/gallery/gallery3)) `GPLv2` `PHP`
   * [Koken](http://koken.me/) - Content management and web site publishing for photographers. `PHP`
   * [Lychee](http://lychee.electerious.com/) - An open source grid and album based photo-management-system. ([Source Code](https://github.com/electerious/Lychee)) `MIT` `PHP`
   * [MediaDrop](http://mediadrop.net/) - A video, audio and podcast publication platform. ([Source Code](https://github.com/mediadrop/mediadrop)) `GPLv3` `Python`