Simplify dark scss, some fixes, more convenient dark_mode()

resources/assets/sass/_block-collapse.scss

@@ -37,3 +37,12 @@
 	}
 }
 
+.card .block-collapse::after{
+	background: linear-gradient(170deg, rgba($card-bg, 0) 30%, $card-bg 90%),
+				linear-gradient(to bottom, rgba($card-bg, 0) 80%, $card-bg 100%);
+}
+
+.infobox .block-collapse::after{
+	background: linear-gradient(170deg, rgba($body-bg, 0) 30%, $body-bg 90%),
+	linear-gradient(to bottom, rgba($body-bg, 0) 80%, $body-bg 100%);
+}

resources/assets/sass/app-dark.scss

@@ -1,30 +1,4 @@
 // Variables
 $theme: dark;
 
-@import "bootstrap";
-
-html {
-    overflow-y: scroll;
-}
-
-@import "helpers";
-@import "fa-utils";
-@import "block-collapse";
-@import "form-help";
-
-@import "bootstrap-customizations/paginate";
-@import "bootstrap-customizations/card";
-@import "bootstrap-customizations/tooltip";
-@import "bootstrap-customizations/navbar";
-@import "bootstrap-customizations/footer";
-@import "bootstrap-customizations/link";
-@import "bootstrap-customizations/border";
-@import "bootstrap-customizations/button";
-@import "bootstrap-customizations/responsive";
-@import "bootstrap-customizations/typography";
-
-.bio-table {
-    td {
-        padding-top: dist(2);
-    }
-}
+@import "app";

resources/assets/sass/bootstrap-customizations/_card.scss

@@ -41,5 +41,5 @@
 }
 
 .card .auth-footer {
-	background-color: $body-bg;
+	background-color: transparent; // see through at the card bg
 }