More markdwown rendering fixes and improvements

- Handle a very large table of contents better.
- Fix handling from same-repo hrefs.
- Improve table rendering.

Author: merks

markdown/index.html

@@ -34,7 +34,6 @@
 			border: 1px solid black;
 			border-collapse: collapse;
 			margin-bottom: 2ex;
-			white-space: nowrap;
 		}
 
 		#table-of-contents {
@@ -81,15 +80,21 @@
 			margin-top: 1.5em;
 		}
 
-		toc .sideitem {
+		#toc .sideitem {
 			padding: 0.5em 0.5em;
+			margin-bottom: 0;
 		}
 
 		#toc h2 {
 			margin-bottom: 0.5em;
 			padding-bottom: 0.0em;
 		}
 
+		#toc #table-of-contents {
+			max-height: 66vh;
+			overflow-y: auto;
+		}
+
 		/*]]>*/
 	</style>
 </head>
@@ -158,7 +163,7 @@
 		if (parts != null && parts.groups.path.endsWith('.md')) {
 			tableOfContentsAside = `
 <div id="toc" class="col-md-6">
-	<aside
+	<aside>
 		<ul class="ul-left-nav">
 			<div  class="sideitem">
 				<h2>Table of Contents</h2>
@@ -285,6 +290,8 @@ <h2>Table of Contents</h2>
 						const siteURL = toSiteURL(logicalHref);
 						if (siteURL != null) {
 							a.href = siteURL;
+						} else if (!href.startsWith('http')) {
+							a.href = new URL(`https://github.com/${org}/${repo}/blob/${branch}/${path}/../${href}`);
 						}
 						continue;
 					}