ece2d4c081
Prior to this change it was not possible to use Bootstrap default SCSS
functions in 'bootstrap_overridden.scss'.
This commit mirrors odoo framework's architecture, injecting bootstrap
'_functions.scss' at the beginning of the documentation's SCSS "bundle".
Commit preparatory to the introduction of the 'Spoiler' documentation
component.
task-3036845
X-original-commit: 1691e8970b
Part-of: odoo/documentation#2877