[zsh] Update shell init: rc

zsh/func/darwin_init_once

@@ -0,0 +1,21 @@
+#!/usr/bin/env zsh
+# Eryn Wells <eryn@erynwells.me>
+
+autoload darwin_icloud_drive_path
+autoload darwin_configure_screenshots_directory
+
+function darwin_init_once
+{
+    # Dim dock icons of apps that have been hidden.
+    shell-log "Auto-hiding Dock"
+    defaults write com.apple.Dock showhidden -boolean yes
+    killall Dock
+
+    darwin_configure_screenshots_directory
+
+    # See https://techstuffer.com/this-app-is-damaged-error-macos-sierra/
+    shell-log "Disabling overly restrictive Gatekeeper"
+    sudo spctl --master-disable
+}
+
+darwin_init_once "$@"