Correct css font path

poul/css/poul.css

@@ -3,7 +3,7 @@
  *
  * Forked from the default black theme.
  */
-@import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+@import url(../../reveal.js/lib/font/source-sans-pro/source-sans-pro.css);
 section.has-light-background,
 section.has-light-background h1,
 section.has-light-background h2,
@@ -306,4 +306,4 @@ body {
 .reveal section.outro img.cc {
   max-height: 10vh;
   padding: 0;
-}
\ No newline at end of file
+}