More minor page count tweaks & fixes

And re-convert with latest htmlbook

oreilly/workflow-style.html

@@ -153,7 +153,7 @@ ggplot2</h1>
     span = 0.5,
     se = FALSE, 
     color = "white", 
-    size = 4
+    linewidth = 4
   ) +
   geom_point()</pre>
 </div>
@@ -179,7 +179,7 @@ Sectioning comments</h1>
 </div>
 </section>
 
-<section id="exercises" data-type="sect1">
+<section id="workflow-style-exercises" data-type="sect1">
 <h1>
 Exercises</h1>
 <ol type="1"><li>
@@ -192,7 +192,7 @@ flights|&gt;filter(carrier=="UA",dest%in%c("IAH","HOU"),sched_dep_time&gt;0900,s
 </li>
 </ol></section>
 
-<section id="summary" data-type="sect1">
+<section id="workflow-style-summary" data-type="sect1">
 <h1>
 Summary</h1>
 <p>In this chapter, you’ve learn the most important principles of code style. These may feel like a set of arbitrary rules to start with (because they are!) but over time, as you write more code, and share code with more people, you’ll see how important a consistent style is. And don’t forget about the styler package: it’s a great way to quickly improve the quality of poorly styled code.</p>