Various updates and fixes

Created by: xTibor

• Fix spelling: github -> GitHub, etc.
• Update the GitHub team list
• Move null: and zero: to the userspace schemes
• Change icons from Oxygen to Faba/Moka
• Remove statements that TFS is a ZFS implementation
• Add Intel HDA to the supported hardware
• Remove the libredox guideline
• Add some outgoing links where I think they're necessary