[FIX] account,purchase,repair,sale,web: fix report layouts

Following BS4 migration and adding sections and notes.

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Document templates:

- Remove margin from <p> in "informations" to allow them to be
	correctly centered vertically on their container.

- Also add a mt- and mb- on their <div> to better handle them going to a new
	line when there are too many of them.

- Add class for section and note to be able to customize them in layouts.

- Add class for price_total to be able to customize it in layouts instead
	of relying on :last-child.

- Add "page-break-inside: avoid;" on the "total" table to not split it
	between pages when it can be avoided.

- Fix sale report template "Informations" to use col-auto just like invoice
	See 6b8d7bb6d68221f77dabb223de4160fdfb87a6f8

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Boxed layout:
	- fix section & note style
	- fix borders in general
	- fix the total table

Background layout:
	- fix section style
	- fix the total table

Clean layout:
	- fix page number vertical align

task-1889346

closes odoo/odoo#27782

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