cleanup(): removed unused gfbox style

public/sass/_grafana.scss

@@ -54,7 +54,6 @@
 @import "components/gf-form";
 @import "components/sidemenu";
 @import "components/navbar";
-@import "components/gfbox";
 @import "components/timepicker";
 @import "components/filter-controls";
 @import "components/filter-list";

public/sass/components/_gfbox.scss

-.gf-box {
-  margin: 10px 5px;
-  background-color: $page-bg;
-  position: relative;
-  border: 1px solid $tight-form-func-bg;
-}
-
-.gf-box-no-margin {
-  margin: 0;
-}
-
-.gf-box-header-close-btn {
-  float: right;
-  padding: 0;
-  margin: 0;
-  background-color: transparent;
-  border: none;
-  padding: 8px;
-  color: $text-color;
-  i {
-    font-size: 120%;
-  }
-  &:hover {
-    color: $white;
-  }
-}
-
-.gf-box-header-save-btn {
-  padding: 7px 0;
-  float: right;
-  color: $gray-2;
-  font-style: italic;
-}
-
-.gf-box-body {
-  padding: 20px;
-  min-height: 150px;
-}
-
-.gf-box-footer {
-  overflow: hidden;
-}
-
-.gf-box-header {
-  border-bottom: 1px solid $tight-form-func-bg;
-  overflow: hidden;
-  background-color: $tight-form-bg;
-  .tabs {
-    float: left;
-  }
-  .nav {
-    margin: 0;
-  }
-}
-
-.gf-box-title {
-  padding-right: 20px;
-  padding-left: 10px;
-  float: left;
-  color: $link-color;
-  font-size: 18px;
-  font-weight: normal;
-  line-height: 38px;
-  margin: 0;
-  .fa {
-    padding: 0 8px 0 5px;
-    color: $text-color;
-  }
-}