NBC has issued strict new anti-sexual harassment rules to employees — including that staffers must snitch on any misbehaving colleagues — in the wake of the firing of disgraced “Today” show host Matt Lauer. A source tells Page Six that NBC employees have been ordered to report any inappropriate relationships in the workplace — and if they fail to do so, they could be fired for covering up for colleagues. Detailed rules also have been issued about conduct in the office, including how to socialize and even how to hug colleagues. A source says, “Romantic relationships at work are not...