general improvements 2022-Dec

[zzywysm]

Here are a few quality of life improvements for NixOS on Apple Silicon.

• We add in wget, curl, and magic-wormhole into the installer configuration in case a user wants to download a configuration.nix while in the installer mode
• We include the Linux firmware set, primarily because it's easier to plug in a USB-to-Ethernet adapter than type in multiple commands to bring up Wi-Fi
• We ignore the Mach-O build of m1n1 because the Apple bootloader hasn't supported custom Mach-O objects since macOS 12.1
• We enlarge the u-boot font so that text is readable during the boot process

[zzywysm]

Due to my weak git skills, I'm closing this pull request and will create a new smaller one against a new branch.