✨ feat(docs) translante the documentation into french

Signed-off-by: Benoit Mortier <benoit.mortier@fusiondirectory.org>

source/index.rst

@@ -3,9 +3,6 @@
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 
-Introduction a FusionDirectory
-===============================
-
 .. image:: /_static/images/fd_logo.png
    :alt: FusionDirectory
    :align: center