[zsh] Convert zprofile to do_init_functions

zsh/func/init_profile_darwin

@@ -5,3 +5,11 @@ if ssh-add --apple-load-keychain; then
     echo
 fi
 
+if binary_exists sw_vers; then
+    cat_program=cat
+    if binary_exists lolcat; then
+        cat_program=lolcat
+    fi
+    print "It's `date +'%H:%M on %A, %B %d'`.\nThis machine is a $HWMODEL.\nYou're running macOS $OSVERSION.\n" | $cat_program
+fi
+