removing unnecessary scss files

app/templates/components/components/back-link/_back-link.scss

@@ -1,54 +0,0 @@
-@import "../../settings/all";
-@import "../../tools/all";
-@import "../../helpers/all";
-
-@include govuk-exports("govuk/component/back-link") {
-
-  .govuk-back-link {
-    @include govuk-typography-responsive($size: 16);
-    @include govuk-link-common;
-    @include govuk-link-style-text;
-
-    display: inline-block;
-    position: relative;
-
-    margin-top: govuk-spacing(3);
-    margin-bottom: govuk-spacing(3);
-
-    // Allow space for the arrow
-    padding-left: 14px;
-
-    // Use border-bottom rather than text-decoration so that the arrow is
-    // underlined as well.
-    border-bottom: 1px solid govuk-colour("black");
-
-    // Underline is provided by a bottom border
-    text-decoration: none;
-
-    // Prepend left pointing arrow
-    &:before {
-      @include govuk-shape-arrow($direction: left, $base: 10px, $height: 6px);
-
-      content: "";
-
-      // Vertically align with the parent element
-      position: absolute;
-
-      top: -1px;
-      bottom: 1px;
-      left: 0;
-
-      margin: auto;
-    }
-  }
-
-  // Begin adjustments for font baseline offset
-  // These should be removed when the font is updated with the correct baseline
-
-  .govuk-back-link:before {
-    $offset: 1px;
-
-    top: $offset * -1;
-    bottom: $offset;
-  }
-}