Like others have said, moonlight is the way to go. However you can also use steam link but turn all the options off on the deck itself (screen, audio) so it’s basically a wii u controller at that point.

I’ve tried that Linux server thing someone else posted and in the end it acts the same as steam link, so I don’t think it’s worthwhile.

But once again, I urge you to look into both moonlight/sunshine, and also moondeckbuddy. It feels like magic once it is set up.