[FIX] website: update main padding top before making the header affixed

When the header goes affixed, a compensating padding-top is added on
the content so that the scroll does not flicker. That padding-top was
added a bit too late and was enough to mess up the scroll on pages where
the content is about the height of the viewport: the header goes affix,
the scrollable content becomes smaller, the padding top is added, a
scroll is detected, the header is un-affixed since above scroll point
-> bug. If the padding top is added first, then there is no problem.

Note: the scroll effects code could probably use some refactoring.

Part of https://github.com/odoo/odoo/pull/56936
task-2312878

closes odoo/odoo#56936

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

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