CleanUp before Update

apps/static/assets/scss/black-dashboard/bootstrap/mixins/_hover.scss

@@ -1,37 +0,0 @@
-// Hover mixin and `$enable-hover-media-query` are deprecated.
-//
-// Originally added during our alphas and maintained during betas, this mixin was
-// designed to prevent `:hover` stickiness on iOS-an issue where hover styles
-// would persist after initial touch.
-//
-// For backward compatibility, we've kept these mixins and updated them to
-// always return their regular pseudo-classes instead of a shimmed media query.
-//
-// Issue: https://github.com/twbs/bootstrap/issues/25195
-
-@mixin hover {
-  &:hover { @content; }
-}
-
-@mixin hover-focus {
-  &:hover,
-  &:focus {
-    @content;
-  }
-}
-
-@mixin plain-hover-focus {
-  &,
-  &:hover,
-  &:focus {
-    @content;
-  }
-}
-
-@mixin hover-focus-active {
-  &:hover,
-  &:focus,
-  &:active {
-    @content;
-  }
-}