Added missing images, handled image maps for the pdf (rendered as simple images)

source/css/common.css

@@ -151,11 +151,6 @@ code {
   display: none;
 }
 
-.imagemap {position: relative;}
-.imagemap img {display: block;}
-.imagemap .area {display: block; position: absolute; transition: box-shadow 0.15s ease-in-out;}
-.imagemap .area:hover {box-shadow: 0px 0px 1vw white;}
-
 /* Keyboard modifiers */
 .mod1:before {        content: "Ctrl ";}
 .mod2:before {        content: "Alt ";}

source/css/pdf.css

@@ -195,3 +195,5 @@ a[href^="#"]::after {
 a[href^="http"]::after {
 	content: " (" attr(href) ")";
 }
+
+.imagemap .area {display: none;}

source/css/screen.css

@@ -229,6 +229,11 @@ body {
   }
 }
 
+.imagemap {position: relative;}
+.imagemap img {display: block;}
+.imagemap .area {display: block; position: absolute; transition: box-shadow 0.15s ease-in-out;}
+.imagemap .area:hover {box-shadow: 0px 0px 1vw white;}
+
 /* for the TOC */
 #content p.chapter,
 #content p.subchapter,