dark mode with bootstrap complete components

Used https://github.com/vinorodrigues/bootstrap-dark-5/releases/tag/v1.0.0

scss/dark/bootstrap/forms/_validation.scss

@@ -0,0 +1,5 @@
+// Form validation
+
+@each $state, $data in $form-validation-states-alt {
+  @include form-validation-state-alt($state, $data...);
+}