The aim of this cleanup is to use as many bootstrap classes, functions
and utilities as possible to reduce the amount of extra code.
Instead of redefining variables, BS variables are overridden in the
bootstrap_overridden file.
In order to be able to reuse these overridden variables within our own
custom variable file — and after consultation with SRI — it was
determined that the variables.scss file should come after the bootstrap
files in the order of importation, unlike the order of odoo website's
scss files.
Changes to variables in bootstrap_overridden have been made to adapt to
the new structure.
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