fix(dev): use portable Bash shebangs (#2536)

Resolve Bash through PATH so repository development entrypoints run on NixOS and other systems without /bin/bash.

scripts/dev-home.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 default_dev_paseo_root() {
   git rev-parse --show-toplevel 2>/dev/null || pwd