Wiki addition for `ntfs_ib_write` crash

The wiki on this repo is currently the most complete doc on NTFS disk usage with Steam. Could you please add this to it? I don't think I can make a PR for a wiki page, if I can please lmk how.

https://github.com/ValveSoftware/Proton/wiki/Using-a-NTFS-disk-with-Linux-and-Windows

Fixing ntfs_ib_write crash caused by Steam

Steam has probably tried to install an app onto the NTFS disk that does not support it (eg SteamLinuxRuntime_sniper).

Use Steam > Settings > Downloads > Steam Library Folders to move the linux applications from the NTFS disk.

In case your NTFS disk unmounts when you launch Steam;

• Move the folder under /steamapps/common/<problematicapp> manually to eg desktop
• Create a symlink at /steamapps/common/<problematicapp> on the NTFS disk to the new temporary location
• Now you can use Steam > Settings > Downloads > Steam Library Folders to move the application from the NTFS disk
• Delete the symlink and the empty folder it links to

Start with the Proton wiki page at https://github.com/ValveSoftware/Proton/wiki/Using-a-NTFS-disk-with-Linux-and-Windows and review its existing NTFS disk guidance. Add the supplied “Fixing ntfs_ib_write crash caused by Steam” section, including the listed Steam Library Folders and symlink steps; it is done when the guidance is published on the wiki.