Lightbox for post images (see 2012-07-04-first-final-release.md as example)

_posts/2012-07-04-first-final-release.md

@@ -14,4 +14,4 @@ just in time for the holidays we've compiled our first final release after rough
 So don't think twice and download it from Sourceforge. How about a round (or two?) of Vocaluxe between the egg hunt and the lamb roast?
 
 You don't want to wait for the next final release and want to follow the latest edge of development instead? Just follow the developers on the Github Vocaluxe repository!
-![Screenshot2](https://vocaluxe.sourceforge.io/style/images/Screenshot_SongSelection_small.png){:class="img-responsive"}
+[![Song Selection](https://vocaluxe.sourceforge.io/style/images/Screenshot_SongSelection_small.png){:class="img-responsive"}]({{site.baseurl}}/img/posts/release-01_Screenshot_SongSelection.png){:class="img-responsive" data-lightbox="screenshots" data-title="Song Selection"}