reshaped the home page frontend

Signed-off-by: Maxime Déraspe <maximilien1er@gmail.com>
fixed minor bug

Signed-off-by: JFRheault <jf.rheault.1@gmail.com>
Merge branch 'master' of https://github.com/fbelleau/PiqueNiqueSemantique
Describe in book.html

Signed-off-by: JFRheault <jf.rheault.1@gmail.com>