css: Adjust style of headers h1, h2 and h3

Signed-off-by: Jordan Justen <jljusten@gmail.com>
css: Set content max-width to prevent really long lines

Signed-off-by: Jordan Justen <jljusten@gmail.com>
index.html: Link main banner to UDK2014

Signed-off-by: Jordan Justen <jljusten@gmail.com>