When updating bootstrap to bootstrap 5 with [1], the h-0 and w-0 extended utility classes were lost. This commit adds them back, using the Utility API of Bootstrap described here [2], and the $utilities-sizes from [3]. Therefore, the code introduced in [4] is not needed anymore (those classes are now available in all Odoo instead of just the frontend). This commit fixes the footer "scroll to top" option of the website builder. [1]: https://github.com/odoo/odoo/commit/971e5a91aab9 [2]: https://getbootstrap.com/docs/5.0/utilities/api/ [3]: https://github.com/odoo/odoo/commit/e377a084174d [4]: https://github.com/odoo/odoo/commit/da55072a6935 closes odoo/odoo#101691 X-original-commit: 3a2ad02962fdea254ca46af1f7728b537a6af9cd Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>