www/devmaster/lesson*.html: Fix header, title, navigation and links.

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
www/index.html: fix command line demos & promote JOGL NApplet GearsJOAL applet

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
Merge remote-tracking branch 'xranby/www'
Merge remote-tracking branch 'xranby/master'