Built in 1961, the single-story home features Midcentury charms such as a courtyard entry, sky-lit hallways and warm wood-and-glass living spaces. It appears Ellen DeGeneres and Portia de Rossi, Southern California’s busiest celebrity home-flippers, have found their next project. Tucked in the gated enclave of Hidden Valley Estates, the 1960s stunner was built by Robert Skinner and later found fame …