Salt & Stone founder Nima Jalali's advice for people starting their own companies: "Go all-in. You can't [have] work-life balance, you can't want to check out at 5. Because there's going to be someone right behind you that's going to come and take your place." "You have to make sure you love it. Because that's the way you're going to be able to do it around the clock, from the moment you wake up to when you go to sleep." "Forget the work-life balance stuff. You have to go hard, and you have…