Move scripts to Nix files

Move the scripts I commonly use into Nix files managed by Home Manager.

Some, like `mounter` and `unmounter` are desktop-only, but this can be
addressed in a future commit to create per-host scripts or
desktop/non-desktop scripts.

This commit also removes a number of unused scripts that are either
included in packages like `git-extras` or aren't used.

modules/home-manager/cli/scripts/mounter.nix

@@ -0,0 +1,45 @@
+{ pkgs }:
+
+pkgs.writeShellApplication {
+  name = "mounter";
+
+  runtimeInputs = with pkgs; [
+    cryptsetup
+    dmenu
+    gawk
+    libnotify
+    util-linux
+  ];
+
+  text = ''
+    lsblk_output="$(lsblk -rpo "uuid,name,type,size,label,mountpoint,mountpoints,fstype" | grep "part" | grep -Ev "/(boot|nix/store)")"
+    partition_names="$(echo "$lsblk_output" | awk '{ printf "%s (%s)\n", $2, $4 }' )";
+
+    selected=$(echo "$partition_names" | dmenu -p "Select drive:" | awk '{ print $1 }')
+    test -n "$selected"
+    mount_device="$selected"
+
+    if sudo cryptsetup isLuks "$selected"; then
+      luks_name="usb"
+
+      ${"TERMINAL:-st"} -n floatterm -g 60x1 -e sudo cryptsetup open "$selected" "$luks_name"
+
+      mount_device="/dev/mapper/$luks_name"
+
+      test -b "/dev/mapper/$luks_name"
+    fi
+
+    mount_point=$(echo -e "/mnt\n/media\n/run/media/$USER" | dmenu -p "Select mount point:")
+    test -n "$mount_point"
+
+    sudo mkdir -p "$mount_point"
+
+    if sudo mount "$mount_device" "$mount_point"; then
+      notify-send "Device mounted" "Mounted $selected at $mount_point."
+    else
+      notify-send "Mount failed" "Failed to mount $selected."
+
+      exit 1
+    fi
+  '';
+}