Use /experimental-installer instead of /nix
Redirect from /experimental-installer to the experimental installer releases instead of /nix. The installer is still experimental so that should be clear from the URL. Also add a few redirects to make URLs nicer. Redirect /experimental-nix to the latest GitHub release script, /experimental-nix/* to the latest GitHub arch specific installers, and use /experimental-nix/tag/$version/* to redirect to specific releases. This allows for a shorter URL for the most common install instruction, and it more closely mirrors the URL structure used by DetSys which is upstream for experimental-nix-installers https://artifacts.nixos.org/experimental-installer -> https://github.com/NixOS/experimental-nix-installer/releases/latest/download/nix-installer.sh https://artifacts.nixos.org/experimental-installer/* -> https://github.com/NixOS/experimental-nix-installer/releases/latest/download/* https://artifacts.nixos.org/experimental-installer/tag/* -> https://github.com/NixOS/experimental-nix-installer/releases/download/*