Optimize the configuration for online viewing and printing

IMO fragments are great for the presentation, but it can be annoying to
have to click through them when viewing the slides.

index.html

@@ -756,8 +756,12 @@
         slideNumber: true,
         history: true,
         width: 1080,
-        height: 720
+        height: 720,
+        // Disable all fragments for normal viewing. They can be enabled for
+        // the presentation with ?fragments=true (URL parameter):
+        fragments: false
       });
+      Reveal.configure({ pdfMaxPagesPerSlide: 1 });
     </script>
   </body>
 </html>