merge scroll-to-top colors

assets/scss/style.scss

@@ -1,11 +1,8 @@
 @import "predefined.scss";
-@import "colors.scss";
-@import "fonts.scss";
 @import "normalize.scss";
 @import "syntax.scss";
 @import "animate.scss";
 @import "scroll.scss";
-@import "admonition.scss";
 @import "socialshare.scss";
 {{ if (fileExists "assets/scss/userstyles.scss") }}
 @import "userstyles.scss";
@@ -990,4 +987,4 @@ a.footnote-ref {
     from, to { border-color: transparent }
     50% { border-color: $typewriter}
   }
-{{ end }}
+{{ end }}