Bootstrap5 (#17)

* Bootstrap5 migration

dev/scss/bootstrap/_progress.scss

@@ -1,16 +1,17 @@
 // Disable animation if transitions are disabled
+
+// scss-docs-start progress-keyframes
 @if $enable-transitions {
   @keyframes progress-bar-stripes {
-    from { background-position: $progress-height 0; }
-    to { background-position: 0 0; }
+    0% { background-position-x: $progress-height; }
   }
 }
+// scss-docs-end progress-keyframes
 
 .progress {
   display: flex;
   height: $progress-height;
   overflow: hidden; // force rounded corners by cropping it
-  line-height: 0;
   @include font-size($progress-font-size);
   background-color: $progress-bg;
   @include border-radius($progress-border-radius);
@@ -38,7 +39,7 @@
   .progress-bar-animated {
     animation: $progress-bar-animation-timing progress-bar-stripes;
 
-    @if $enable-prefers-reduced-motion-media-query {
+    @if $enable-reduced-motion {
       @media (prefers-reduced-motion: reduce) {
         animation: none;
       }