[IMP] website: fix interaction between ToC snippet and header effects

This commit also add the possibility to indicate a "top gap" = a part
on the top of the header which is not supposed to be shown once the page
is scrolled (this is a leftover of the "preheader" task which was
cancelled for something better, but that JS code still made sense as a
possibility).

Part of https://github.com/odoo/odoo/pull/56427
task-2264627

Co-authored-by: Benjamin Vray <bvr@odoo.com>

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