Landing page additions

[belgattitude]

As of the 6.2.11-rc-2 version, the landing page is pretty minimal, see index.jsp.

Could be nice to provide a enhanced version... Some ideas:

• System informations like 'JAVA version JDK home...'
• If possible display included libraries (mysql:mysql-connector, ...) to help debugging

The pjb-starter-springboot contains some design prototype for inspiration but requires thymeleaf and spring to run (let's avoid too many deps in the php-java-bridge version)

As I'm not used to jsp... I would really appreciate if someone can make a preliminary concept (css, index.jsp and system info). I can eventually rework on design later one.

[belgattitude]

Closed now with a minimal design, feel free to reopen...

A thing that can help debugging and helping support is a separate table with information of registered jars present in the /WEB-INF/lib folder.... Looks it's a common issue when starting develop.