Advice to Nvidia’s board: choose a techie.As the chip giant’s directors seek a replacement to Jensen Huang, the history of successions at Silicon Valley companies suggests that the odds of long-term success are better with a person steeped in technology and product development rather than finance, sales or marketing.Replacing a founder is a defining moment for any company, whether it has been planned for years or is a sudden departure, whether the company is thriving or faltering.For Huang, Nvidia’s co-founder and former CEO, the fall came remarkably quickly. He resigned on Nov 12 after the disclosure of affairs with a…