*: Use /usr/bin/env in shebangs for bash & zsh

To increase the portability (OSX for example has zsh under `/bin/zsh`).

.config/polybar/launch.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 XDG_CONF="${XDG_CONFIG_HOME:-$HOME/.config}"
 BASE_DIR="$XDG_CONF/polybar"

.config/polybar/scripts/battery.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 ## config
 

.config/polybar/scripts/bluetooth.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # See https://github.com/polybar/polybar-scripts/pull/237
 
 bluetooth_print() {

.config/polybar/scripts/calendar.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # The separation and recursion is sadly necessary since reload is apparently
 # executed in a subshell and thus using an environment variable does not work

.config/polybar/scripts/pub_ipv4.sh

@@ -1,3 +1,3 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 echo $(curl -s https://ipinfo.io/ip)