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/perf.html b/docs/perf.html
index ee9c4b1..ec400c6 100644
--- a/docs/perf.html
+++ b/docs/perf.html
@@ -1,16 +1,17 @@
-<HTML>
+<!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>Performance Tips</title>
+  <link rel="stylesheet" type="text/css" href="mesa.css">
+</head>
+<body>
 
-<TITLE>Performance Tips</TITLE>
-
-<link rel="stylesheet" type="text/css" href="mesa.css"></head>
-
-<BODY>
-
-<H1>Performance Tips</H1>
+<h1>Performance Tips</h1>
 
 <p>
 Performance tips for software rendering:
-</P>
+</p>
 <ol>
 
 <li> Turn off smooth shading when you don't need it (glShadeModel)
@@ -64,5 +65,5 @@
 </ol>
 
 
-</BODY>
-</HTML>
+</body>
+</html>