docs: consolidate html header and footer

add doctype
add character encoding
add missing <head> tag
unify html header and footer

Signed-off-by: Brian Paul <brianp@vmware.com>
diff --git a/docs/sourcetree.html b/docs/sourcetree.html
index e26c653..abc5e39 100644
--- a/docs/sourcetree.html
+++ b/docs/sourcetree.html
@@ -1,10 +1,11 @@
-<HTML>
-
-<TITLE>Mesa Source Tree</TITLE>
-
-<link rel="stylesheet" type="text/css" href="mesa.css"></head>
-
-<BODY>
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html lang="en">
+<head>
+  <meta http-equiv="content-type" content="text/html; charset=utf-8">
+  <title>Mesa Source Tree</title>
+  <link rel="stylesheet" type="text/css" href="mesa.css">
+</head>
+<body>
 
 <h1>Mesa source code tree overview</h1>
 
@@ -157,5 +158,5 @@
 </ul>
 
 
-</BODY>
-</HTML>
+</body>
+</html>