www/index.html: Switch github -> jogamp link to source for lessons 1,2,3,5 & 8

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
www/devmaster/lesson*.html: Fix relative jnlp links.

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
www/devmaster/lesson*.html: Fix links to original DevMaster.net articles.

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
www/devmaster/lesson*.html: net.java.games.joal.* -> com.jogamp.openal.*

The Java OpenAL JOAL HTML tutorials are now usefull.
This change made is possible to copy and paste the many code sections
of the JOAL tutorial into working applications.

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>