Davis retained the top spot in one website's ranking of the Sacramento area's top suburbs. Just like last year, Davis is No. 1 in the rankings released by Niche, a Pittsburgh-based website that ranks neighborhoods and schools. Check out the accompanying slideshow to see the area's other top suburbs, according to Niche. The website defines "suburb" as a place within a census-defined urbanized area, but outside the principal city, with a population of at least 1,000. Relying on sources such as census…