Change bootstrap to source version

bootstrap/site/assets/scss/_sidebar.scss

@@ -0,0 +1,64 @@
+.bd-sidebar {
+  @include media-breakpoint-up(lg) {
+    position: sticky;
+    top: 5rem;
+    // Override collapse behaviors
+    // stylelint-disable-next-line declaration-no-important
+    display: block !important;
+    height: subtract(100vh, 6rem);
+    // Prevent focus styles to be cut off:
+    padding-left: .25rem;
+    margin-left: -.25rem;
+    overflow-y: auto;
+  }
+
+  @include media-breakpoint-down(lg) {
+    .offcanvas-lg {
+      border-right-color: var(--bs-border-color);
+      box-shadow: var(--bs-box-shadow-lg);
+    }
+  }
+}
+
+.bd-links-heading {
+  color: var(--bs-emphasis-color);
+}
+
+.bd-links-nav {
+  @include media-breakpoint-down(lg) {
+    font-size: .875rem;
+  }
+
+  @include media-breakpoint-between(xs, lg) {
+    column-count: 2;
+    column-gap: 1.5rem;
+
+    .bd-links-group {
+      break-inside: avoid;
+    }
+
+    .bd-links-span-all {
+      column-span: all;
+    }
+  }
+}
+
+.bd-links-link {
+  padding: .1875rem .5rem;
+  margin-top: .125rem;
+  margin-left: 1.125rem;
+  color: var(--bs-body-color);
+  text-decoration: if($link-decoration == none, null, none);
+
+  &:hover,
+  &:focus,
+  &.active {
+    color: var(--bs-emphasis-color);
+    text-decoration: if($link-hover-decoration == underline, none, null);
+    background-color: var(--bd-sidebar-link-bg);
+  }
+
+  &.active {
+    font-weight: 600;
+  }
+}