Add Bootstrap and Bootstrap Icons files

assets/paige/bootstrap/css/_mixins.scss

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+// Toggles
+//
+// Used in conjunction with global variables to enable certain theme features.
+
+// Vendor
+@import "vendor/rfs";
+
+// Deprecate
+@import "mixins/deprecate";
+
+// Helpers
+@import "mixins/breakpoints";
+@import "mixins/color-mode";
+@import "mixins/color-scheme";
+@import "mixins/image";
+@import "mixins/resize";
+@import "mixins/visually-hidden";
+@import "mixins/reset-text";
+@import "mixins/text-truncate";
+
+// Utilities
+@import "mixins/utilities";
+
+// Components
+@import "mixins/backdrop";
+@import "mixins/buttons";
+@import "mixins/caret";
+@import "mixins/pagination";
+@import "mixins/lists";
+@import "mixins/forms";
+@import "mixins/table-variants";
+
+// Skins
+@import "mixins/border-radius";
+@import "mixins/box-shadow";
+@import "mixins/gradients";
+@import "mixins/transition";
+
+// Layout
+@import "mixins/clearfix";
+@import "mixins/container";
+@import "mixins/grid";