With the renaming of the "Backend" and "Frontend" directories to "Python
framework" and "JavaScript framework", and since we may want to document
modules that mainly rely on JavaScript, it makes sense to move the
"Standard modules" one level up from under "Python framework" directly
under "Reference".
closesodoo/documentation#2456
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>
