no break after hn + add ToC page numbers support

hdoc_to_pdf/css/main.css

@@ -45,6 +45,10 @@
   @bottom-center { content: counter(page) }
 }
 
+body {
+  margin: 0;
+}
+
 * {
   font-family: "CMU Serif";
 }
@@ -122,14 +126,12 @@ ul.toc.level4 > li {padding-left: 13mm;}
 ul.toc.level5 > li {padding-left: 15mm;}
 ul.toc.level6 > li {padding-left: 17mm;}
 
+ul.toc > li > a::after {
+  /*left: 0;*/
+  content: leader(dotted) target-counter(attr(href), page);
+}
 
-  
-
-
-
-
-
-/* Title formatting */
+/* Main Title formatting */
 
 h1 {
   padding-top: 20mm;
@@ -155,3 +157,11 @@ img {
   page-break-after: auto;
   page-break-inside: avoid;
 }
+
+/* Widows and orphans processing */
+
+h2, h3, h4, h5, h6 {
+  /*page-break-before: auto;*/
+  page-break-after: avoid;
+  /*page-break-inside: avoid;*/
+}