Add flathub flatpak mpv to Installation instructions

[fastrizwaan]

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Name	Status	Preview	Comments	Updated (UTC)
mpv-io	❌ Failed (Inspect)			Aug 10, 2023 10:40am

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❌ Deploy Preview for velvety-cuchufli-b7a63b failed.

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[Dudemanguy]

I have no idea how this works but looks fine? @sfan5 did some stuff around here recently so I'll let him weigh in if something more needs to be done than besides just editing the file.

[sfan5]

There's nothing more that needs to be done but I'm not too happy with the flatpak because it has a few non-standard customizations and users using it are likely to open bad issues since we can't tell them to mpv --no-config --log-file.

[Dudemanguy]

Oh really? That's unfortunate. I don't really know anything about flatpak, but I would rather not merge it either in that case.

[Erick555]

There's nothing more that needs to be done but I'm not too happy with the flatpak because it has a few non-standard customizations and users using it are likely to open bad issues since we can't tell them to mpv --no-config --log-file.

you may tell them io.mpv.Mpv --no-config --log-file instead.
(alternatively flatpak run io.mpv.Mpv --no-config --log-file)