Update FreeTube links in documentation (#85)

Updated website and source links for FreeTube.

Author: Marbe

apps/freetube.md

@@ -1,8 +1,13 @@
 # FREETUBE
 
  An Open Source YouTube app for privacy
+
+![Watching a video](https://raw.githubusercontent.com/FreeTubeApp/FreeTubeApp.io/master/src/images/FreeTube2.png)
+ 
+
+ SITE: https://freetubeapp.io
 
- SITE: https://github.com/FreeTubeApp/FreeTube
+ SOURCE: https://github.com/FreeTubeApp/FreeTube
 
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