Set shebangs for shellcheck.

home/dotfiles/bash_profile

@@ -1 +1,4 @@
+#!/bin/bash
+
+# shellcheck source=profile
 source ~/.profile

home/dotfiles/bashrc

@@ -1,6 +1,4 @@
-#
-# ~/.bashrc
-#
+#!/bin/bash
 
 # If not running interactively, don't do anything
 [[ $- != *i* ]] && return

home/dotfiles/zprofile

@@ -1 +1,3 @@
+#!/bin/zsh
+
 source ~/.profile