[Trisquel-users] Proposal: Update "Enable DVD Playback"

[joelh]

One of the thing I first noticed about Trisquel is that libdvdcss is  
unsupported. Thankfully we have a wiki page dedicated to installing it, But  
the shell script noted on the wiki is no longer present in T8.0.

I did some digging and noticed that the VideoLAN page has a Debian repo with  
it. First we should test if this installation method works, then update the  
wiki accordingly.