rm unused file

src/sass/themes/default-dark.scss

-/*! Bootstrap `Default` https://getbootstrap.com/docs/4.6 */
-
-@use 'sass:map';
-
-
-///==========================================
-///   Theme variable overrides
-///==========================================
-
-@import "./abstract";
-
-// Colors
-$primary: #005a9a;
-$secondary: $blue;
-
-// Palettes
-$theme-colors: map.merge(
-  $theme-colors,
-  (
-    "primary":    $primary,
-    "secondary":  $secondary,
-  )
-);
-$palette-semantic: $theme-colors;
-
-$palette-gray: (
-  '0':    $white,
-  '50':   $gray-50,
-  '100':  $gray-100,
-  '150':  $gray-150,
-  '175':  $gray-175,
-  '200':  $gray-200,
-  '300':  $gray-300,
-  '400':  $gray-400,
-  '500':  $gray-500,
-  '600':  $gray-600,
-  '700':  $gray-700,
-  '800':  $gray-800,
-  '900':  $gray-900,
-  '1000': $black
-);
-
-$palette-pastel: (
-  'green':  $pastel-green,
-  'blue':   $pastel-blue,
-  'yellow': $pastel-yellow,
-  'red':    $pastel-red,
-  'orange': $pastel-orange,
-  'purple': $pastel-purple
-);
-
-
-///==========================================
-///   Custom styles specific to the theme
-///==========================================
-
-@import './_base';
-
-// Rectify "secondary" button tonal contrast
-.btn-secondary,
-.btn-secondary:hover,
-.btn-outline-secondary:not(:disabled):not(.disabled):hover,
-.btn-outline-secondary:not(:disabled):not(.disabled):active,
-.btn-outline-secondary:not(:disabled):not(.disabled).active,
-.show > .btn-outline-secondary.dropdown-toggle {
-  color: $white;
-}
-
-// Alter <b-alert> light variant for better contrast
-.alert.alert-light {
-  border-color: $gray-150;
-  color: $gray-600;
-}