Add demo and source code links for Piwigo

README.md

@@ -1026,7 +1026,7 @@ See https://github.com/n1trux/awesome-sysadmin#metric--metric-collection
 - [Photofloat](http://blog.zx2c4.com/567) - Web 2.0 Photo Gallery Done Right via Static JSON and Dynamic Javascript. ([Demo](http://photos.jasondonenfeld.com/)) `GPL-2.0` `Python`
 - [PhotoLight](https://github.com/thibaud-rohmer/PhotoLight) - The easiest photo gallery there is. `GPL-3.0` `PHP`
 - [Photoshow](http://www.photoshow-gallery.com/) - Responsive Web Gallery. ([Source Code](https://github.com/thibaud-rohmer/PhotoShow)) `GPL-3.0` `PHP`
-- [Piwigo](http://piwigo.org/) - Photo gallery software for the web, built by an active community of users and developers. `GPL-2.0` `PHP`
+- [Piwigo](http://piwigo.org/) - Photo gallery software for the web, built by an active community of users and developers. ([Demo](http://piwigo.org/demo/), [Source Code](https://github.com/Piwigo/Piwigo)) `GPL-2.0` `PHP`
 - [Plumi](http://blog.plumi.org/) - Create your own sophisticated video-sharing site. ([Source Code](https://github.com/plumi/plumi.app)) `GPL-2.0` `Python`
 - [sigal](https://github.com/saimn/sigal) - Yet another simple static gallery generator. `MIT` `Python`
 - [UberGallery](http://www.ubergallery.net) - UberGallery is an easy to use, simple to manage, web photo gallery. UberGallery does not require a database and supports JPEG, GIF and PNG file types. Simply upload your images and UberGallery will automatically generate thumbnails and output HTML. ([Source Code](https://github.com/UberGallery/UberGallery)) `MIT` `PHP`