Do not hardcode path to bash interpreter

I am unable to use these scripts on NixOS, since the bash interpreter is
in a different location to more conventional distros. Currently is is
/nix/store/jlg2n512jxnr1lxs72r1frxqdsf7jpdj-system-path/bin/bash on my
machine.

This patch uses env to find the correct path to the interpreter.

script/gogh.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 echo -e "
 Gogh