It’s called a splash page, I called it a “hub” because I think this is more what it is.
the central part of a wheel, rotating on or with the axle, and from which the spokes radiate.
• a place or thing that forms the effective center of an activity, region, or network : the kitchen was the hub of family life.
It’s been developed by aboutdotme to allow us to build online a simple identity, and I have to say I really like it. So many scattered contributions in the big ocean of the world wide web can be accessed from that page: check mine out!