update to latest bs4 from git and change hidden-* classes to d-*

view/theme/redbasic/css/style.css

@@ -1435,10 +1435,6 @@ blockquote {
 	border-radius: $radius;
 }
 
-.btn-outline-secondary:hover {
-	color: $font_colour;
-}
-
 /*
 .navbar-inverse {
 	background-image: -webkit-linear-gradient(top, $nav_gradient_top 0%, $nav_gradient_bottom 100%);
@@ -1510,16 +1506,6 @@ blockquote {
 		left: 0px;
 	}
 
-	.thread-wrapper.toplevel_item {
-		width: 100%;
-		border:1px;
-	}
-
-	.acl-list-item {
-		width: 98%; /* fallback if browser does not support calc() */
-		width: calc(100% - 10px);
-	}
-
 }
 
 .shareable_element_text {