vlc is no longer shipped by defualt so reflect that in the help docs (#30)

* Update en.md
* add mpv img
* Delete vlc.jpg
* Update en.md

common-tasks/watching-videos/en.md

@@ -3,6 +3,6 @@ title = "Watching Videos"
 +++
 # Watching Videos
 
-Solus comes pre-installed with the [VLC Media Player](http://www.videolan.org/vlc/index.html), enabling you to watch your favorite movies, t.v. shows, DVDs, and Blu-rays.
+Solus comes pre-installed with the [GNOME MPV](https://gnome-mpv.github.io/) - a GTK+ frontend for [mpv](https://mpv.io/), enabling you to watch your favorite movies, t.v. shows, DVDs, and Blu-rays.
 
-{{< altimg "vlc.jpg" "help-center/common-tasks/watching-videos/" >}}
+{{< altimg "mpv.jpg" "help-center/common-tasks/watching-videos/" >}}