Revert "feat(niri,xbacklight): Brightness control"

This reverts commit 9b0e21d04d786116d2578cb4e4a526619e79a7c4.

hosts/fruitbook/configuration.nix

@@ -11,7 +11,6 @@
     wifi.enable = true;
     stylix.enable = true;
     niri.enable = true;
-    xbacklight-permissions.enable = true;
     users.users = [
       "crumb"
     ];

hosts/fruitbook/disks.nix

@@ -0,0 +1,73 @@
+# sudo nix --experimental-features "nix-command flakes" run github:nix-community/disko/latest -- --mode disko /persist/dots/hosts/nixos-testbed/disko-config.nix
+# time sudo nixos-install --flake /persist/dots#nixos-testbed
+{ lib, ... }:
+{
+  # imports = [ disko.nixosModules.disko ];
+  boot.initrd.supportedFilesystems.btrfs = true;
+  boot.supportedFilesystems.btrfs = true;
+
+  # From Impermanence's README: "Important note: Make sure your persistent
+  # volumes are marked with neededForBoot, otherwise you will run into
+  # problems."
+  fileSystems."/persist".neededForBoot = true;
+
+  disko.devices = {
+    disk = {
+      bootroot = {
+        type = "disk";
+        device = "/dev/disk/by-id/ata-APPLE_SSD_SM0512G_S29ANYAH526520-part4";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              size = "512M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "btrfs";
+
+                mountpoint = "/partition-root";
+                swap.swapfile.size = "4G";
+
+                # Override existing partitions.
+                extraArgs = [ "-f" ];
+
+                # Subvolumes must set a mountpoint in order to be mounted,
+                # *unless their parent is mounted*.
+                subvolumes = {
+                  # Subvolume names do not necessarily correspond to
+                  # mountpoints, despite the structural resemblance to a file
+                  # path.
+                  "/rootfs" = {
+                    mountpoint = "/";
+                  };
+                  "/nix" = {
+                    mountpoint = "/nix";
+                  };
+                  "/persist" = {
+                    mountpoint = "/persist";
+                  };
+                  "/persist/home" = {
+                    mountpoint = "/persist/home";
+                  };
+                  "/swap" = {
+                    mountpoint = "/.swapvol";
+                    swap.swapfile.size = "4G";
+                  };
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}