Fix shebangs for NixOS users

There are a couple of places in the documentation where `/bin/bash`
are referenced (this doesn't exist on NixOS).  For compatibility, change
these to `/usr/bin/env bash`.  Leave `/bin/sh` intact as it isn't an
issue.

pages/Configuring/Expanding-functionality.md

@@ -13,7 +13,7 @@ This bash script will change the outer gaps to 20 if the currently focused
 monitor is DP-1, and 30 otherwise.
 
 ```bash
-#!/bin/bash
+#!/usr/bin/env bash
 
 function handle {
   if [[ ${1:0:10} == "focusedmon" ]]; then

pages/FAQ/_index.md

@@ -199,7 +199,7 @@ they might launch before that has happened.
 In such cases, a script like this:
 
 ```bash
-#!/bin/bash
+#!/usr/bin/env bash
 sleep 4
 killall -e xdg-desktop-portal-wlr
 killall xdg-desktop-portal

pages/Useful Utilities/Hyprland-desktop-portal.md

@@ -98,7 +98,7 @@ XDPH will work on other wlroots compositors, but features available only on Hypr
 
 For a nuclear option, you can use this script and `exec-once` it:
 ```sh
-#!/bin/bash
+#!/usr/bin/env bash
 sleep 1
 killall -e xdg-desktop-portal-hyprland
 killall -e xdg-desktop-portal-wlr

pages/Useful Utilities/Status-Bars.md

@@ -119,7 +119,7 @@ This widget displays a list of workspaces 1-10. Each workspace can be clicked on
 ### `~/.config/eww/scripts/change-active-workspace`
 
 ```sh
-#! /bin/bash
+#!/usr/bin/env bash
 function clamp {
 	min=$1
 	max=$2
@@ -156,7 +156,7 @@ socat -u UNIX-CONNECT:/tmp/hypr/$HYPRLAND_INSTANCE_SIGNATURE/.socket2.sock - |
 ### `~/.config/eww/scripts/get-workspaces`
 
 ```sh
-#!/bin/bash
+#!/usr/bin/env bash
 
 spaces (){
 	WORKSPACE_WINDOWS=$(hyprctl workspaces -j | jq 'map({key: .id | tostring, value: .windows}) | from_entries')