load argv[1] as script and remove default paths

doc/riverguile.1

@@ -7,6 +7,7 @@ riverguile \- scheme powered scripting layer for river
 .
 .SH SYNOPSIS
 .SY riverguile
+path-to-script
 .YS
 .
 .
@@ -17,20 +18,29 @@ Scripting layer for the
 Wayland server.
 Allows the user to send commands to the Wayland server (probably river) and
 install handlers for events from a scheme script.
+The sheme implementation is provided by
+.BR guile (1).
 .P
-By default, riverguile will exit after the script has been loaded and evaluated.
-If certain handlers are installed it will run continously.
+The canonical way to use riverguile is as an interpreter for the river init
+script.
+To do so place the following expression at the very top of your init script:
 .P
-Uppon launch, riverguile tries to load the script from the following paths
-in the given order:
-.IP \(bu 2
-\fBlayout.scm\fR
-.IP \(bu 2
-\fB$XDG_CONFIG_HOME/river/layout.scm\fR
-.IP \(bu 2
-\fB$HOME/.config/river/layout.scm\fR
-.IP \(bu 2
-\fB/etc/riverguile/layout.scm\fR
+.RS
+.EX
+#!/bin/env riverguile
+!#
+.EE
+.RE
+.P
+Do not leave out the second line, as the octothorpe plus exlamation-mark
+combination indicates a multi-line comment in scheme.
+Do not forget to mark your init script as executable.
+Your custom scheme code to configure the river session may follow after these
+two lines.
+.P
+By default, riverguile will exit after the script has been loaded.
+However if certain handlers are installed it will run continously to provide
+that functionality.
 .
 .
 .SH COMMANDS