Update start.sh

Update the bash script so that non-standard distros, such as Nixos, will be able to run the file without editing it. This does not affect current behavior; it just makes it so other distros will work OOTB.

start.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 if ! command -v npm &> /dev/null
 then