Fix documentation wrt greeter

README.md

@@ -7,7 +7,7 @@ Managed with [chezmoi](https://www.chezmoi.io)
 I use greetd with gtkgreet as the greeter/login manager.  Because this is
 installed and configured as a system level service, its configuration cannot
 be managed by chezmoi.  Thankfully, when using cage, it's as straightforward
-as using the following configuration file:
+as using the following configuration file (at `/etc/greetd/config.toml`):
 
 ```toml
 [terminal]
@@ -20,7 +20,7 @@ vt = 1
 
 # `agreety` is the bundled agetty/login-lookalike. You can replace `/bin/sh`
 # with whatever you want started, such as `sway`.
-command = "GTK_THEME='Adwaita:dark' cage -s -- gtkgreet --background /usr/share/backgrounds/archlinux/wild.png --layer-shell"
+command = "/etc/greetd/greeter"
 
 # The user to run the command as. The privileges this user must have depends
 # on the greeter. A graphical greeter may for example require the user to be
@@ -28,6 +28,17 @@ command = "GTK_THEME='Adwaita:dark' cage -s -- gtkgreet --background /usr/share/
 user = "greeter"
 ```
 
+And putting the greeter script at `/etc/greetd/greeter`:
+
+```bash
+#!/bin/sh
+
+GTK_THEME="Adwaita:dark" exec cage -s -- \
+        gtkgreet \
+        --background /usr/share/backgrounds/archlinux/wild.png \
+        --layer-shell
+```
+
 This only requires installing greetd, gtkgreet, cage and the archlinux
 backgrounds packages.  Unlike the setup with sway, this doesn't require
 a loose formation of configuration files.