Apache redirects to handle db-class.com and db-class.org (#1817)

Testing

- on staging, set up redirects and they worked.  Since DB there is old, actually had them redir to prod.
- tested on both app and util servers
- on dev, where redirectors aren't needed, worked fine

The production env file is already set up with this stanza in the environment file:

    "redirects" => {
        "dbclassorg" => {
            "from" => "db-class.org",
            "to" => "class2go.stanford.edu/db"
        },  
        "dbclasscom" => {
            "from" => "db-class.com",
            "to" => "class2go.stanford.edu/db"
        },  
    },