update docs

packages/artplayer/src/style/fullscreenRotate.less

@@ -1,11 +0,0 @@
-.art-fullscreen-rotate {
-    position: fixed;
-    z-index: 9999;
-    width: 100%;
-    height: 100%;
-    left: 0;
-    top: 0;
-    right: 0;
-    bottom: 0;
-    background-color: #000;
-}

packages/artplayer/src/style/index.less

@@ -14,7 +14,6 @@
 @import './hideCursor.less';
 @import './aspectRatio.less';
 @import './fullscreenWeb.less';
-@import './fullscreenRotate.less';
 @import './mini.less';
 @import './autoSize.less';
 @import './flip.less';