Updated several games

· Delver: Updated description, set steam as true, and added a review, a steam, and the webstore URLs
· Doorways: Removed the Chapter 1-4 widget, updated description, set steam as true, and added a steam and the webstore URLs
· FEZ: Updated description, set linux and mac as true, and added the webstore URL
· Oniken: Set linux and mac as true, and edited the notes


- Credit to Grinsekatze from PCGamingWiki