This commit aims to improve the documentation's navigability by
redefining some categories' purposes and titles.
There is a redirection rule for each documentation page moved.
This ensures that users won't have a 404 error message.
task-3217827
closesodoo/documentation#8061
Signed-off-by: Jonathan Castillo (jcs) <jcs@odoo.com>
Lara Martini (larm)