include URWPalladioL in the fonts used by ccap-psychology

Also, it appears `ccap-psychology.css` contained 2 copies of all the CSS selectors. See https://github.com/Connexions/oer.exports/blob/master/css/ccap-psychology.css and search for `div.book > div.appendix > div.titlepage > div > div:not(:first-child) {`