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/extensions.html b/docs/extensions.html
index 91ed20e..d96445c 100644
--- a/docs/extensions.html
+++ b/docs/extensions.html
@@ -1,12 +1,13 @@
-<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>Mesa Extensions</title>
+  <link rel="stylesheet" type="text/css" href="mesa.css">
+</head>
+<body>
 
-<TITLE>Mesa Extensions</TITLE>
-
-<link rel="stylesheet" type="text/css" href="mesa.css"></head>
-
-<BODY>
-
-<H1>Mesa Extensions</H1>
+<h1>Mesa Extensions</h1>
 
 <p>
 A number of extensions have been developed especially for Mesa.
@@ -14,22 +15,21 @@
 </p>
 
 
-<UL>
-<LI><A HREF="MESA_agp_offset.spec">MESA_agp_offset.spec</A>
-<LI><A HREF="MESA_copy_sub_buffer.spec">MESA_copy_sub_buffer.spec</A>
-<LI><A HREF="MESA_packed_depth_stencil.spec">MESA_packed_depth_stencil.spec</A>
-<LI><A HREF="MESA_pack_invert.spec">MESA_pack_invert.spec</A>
-<LI><A HREF="MESA_pixmap_colormap.spec">MESA_pixmap_colormap.spec</A>
-<LI><A HREF="MESA_release_buffers.spec">MESA_release_buffers.spec</A>
-<LI><A HREF="MESA_resize_buffers.spec">MESA_resize_buffers.spec</A>
-<LI><A HREF="MESA_set_3dfx_mode.spec">MESA_set_3dfx_mode.spec</A>
-<LI><A HREF="MESA_sprite_point.spec">MESA_sprite_point.spec</A> (obsolete)
-<LI><A HREF="MESA_texture_signed_rgba.spec">MESA_texture_signed_rgba.spec</A>
-<LI><A HREF="MESA_trace.spec">MESA_trace.spec</A> (obsolete)
-<LI><A HREF="MESA_window_pos.spec">MESA_window_pos.spec</A>
-<LI><A HREF="MESA_ycbcr_texture.spec">MESA_ycbcr_texture.spec</A>
-</UL>
+<ul>
+<li><a href="MESA_agp_offset.spec">MESA_agp_offset.spec</a>
+<li><a href="MESA_copy_sub_buffer.spec">MESA_copy_sub_buffer.spec</a>
+<li><a href="MESA_packed_depth_stencil.spec">MESA_packed_depth_stencil.spec</a>
+<li><a href="MESA_pack_invert.spec">MESA_pack_invert.spec</a>
+<li><a href="MESA_pixmap_colormap.spec">MESA_pixmap_colormap.spec</a>
+<li><a href="MESA_release_buffers.spec">MESA_release_buffers.spec</a>
+<li><a href="MESA_resize_buffers.spec">MESA_resize_buffers.spec</a>
+<li><a href="MESA_set_3dfx_mode.spec">MESA_set_3dfx_mode.spec</a>
+<li><a href="MESA_sprite_point.spec">MESA_sprite_point.spec</a> (obsolete)
+<li><a href="MESA_texture_signed_rgba.spec">MESA_texture_signed_rgba.spec</a>
+<li><a href="MESA_trace.spec">MESA_trace.spec</a> (obsolete)
+<li><a href="MESA_window_pos.spec">MESA_window_pos.spec</a>
+<li><a href="MESA_ycbcr_texture.spec">MESA_ycbcr_texture.spec</a>
+</ul>
 
-
-</BODY>
-</HTML>
+</body>
+</html>