[IMP] website: Clean and simplify res_config view
[IMP] website: Clean and simplify res_config view

Purpose
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- Settings are too complex: too long + too many options that shouldn't be suggested with checkboxes

e.g. twitter roller is now suggested as a new snippet to install from website editor
google maps, slides, forum, etc. should show up in the apps store

- When saving the page I expect to stay in the settings -> no redirection to homepage anymore!

Specification
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See task 33620

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo