Former Boston Bruins captain Brad Marchand said Monday it was sad to leave a place he looks at as home, but he is looking forward to the next chapter in his career with the defending Stanley Cup champion Florida Panthers.”When the trade happened, I was disappointed and I was sad, but I’m still extremely grateful that I get to come to an incredible place, an incredible team, a very, very, very competitive team,” the 36-year-old left-winger said Monday, wearing a Panthers cap. Bruins general manager Don Sweeney said the team acquired a 2027 conditional second-round draft pick from the Florida Panthers in exchange for Marchand. “I love the organization. I wanted to stay there. But at the end of the day, I also know the business is business, and every player has a shelf life. And regardless if that’s when, we want it to be or not, sometimes there’s things …