README: Don't mention fjordlauncher-bin MPR package

prismlauncher-bin [1] is out of date and so fjordlauncher-bin also hasn't been updated in a while. Not sure whether -bin packages are dangerous on MPR as they are on AUR, so we'll just omit it from the install instructions for now.

[1] https://mpr.makedeb.org/packages/prismlauncher-bin

README.md

@@ -72,7 +72,6 @@ Install from the MPR with [Mist](https://docs.makedeb.org/using-the-mpr/mist-the
 
 ```Shell
 mist install fjordlauncher
-mist install fjordlauncher-bin # binary package
 mist install fjordlauncher-git # build latest Git commit from source
 ```