The “Jackass” style is heavily influenced by lo-fi underground skate videos from the 1980s and ’90s, in which skaters in a crew showed off their tricks to music. By ALISSA WILKINSON That the “Jackass” franchise is perhaps the most successful documentary series of all time is indisputable. Its best-known star, Johnny Knoxville, has the concussions to prove it. Twenty-five years in, as “Jackass: Best and Last” hits theaters, it’s still a little tricky to pin down what exactly the franchise…