This branch is just for "good to have" optional stand-alone sass features.
In this commit, I aimed to make some things more like bootstrap 5 for ease of use. I changed the grid breakpoints to match that of Bootstrap 5's and added media query mixins that are more logical like in bootstrap 5.
Improves search bar with SVG icon support for better visual consistency.
Adds utility SCSS file for managing global styles like heading selectors.
Introduces a checkmark SVG asset and reorganizes custom SCSS files following the 7-in-1 structure for better maintainability.
Comments out optional USP bar code in header.tpl to allow easy activation.
