rename changetitle into edittitle & remove the unused comments

src/component/common/PopinFixed/PopinFixedHeader.jsx

         {props.name}
       </div>
 
-      <div className={classnames('wsFileGeneric__header__changetitle', `${props.customClass}__header__changetitle`)}>
+      <div className={classnames('wsFileGeneric__header__edittitle', `${props.customClass}__header__changetitle`)}>
         <i className='fa fa-pencil' />
       </div>
 

src/css/Generic.styl

       text-overflow ellipsis
       overflow hidden
       white-space nowrap
-    &__changetitle
+    &__edittitle
       margin 0 15px
       color white
       font-size 20px
     display flex
     flex-direction column
 
-// // in Variable.styl
-// pageHtmlColor = #...
-// pageHtmlColor-hover = darken(pageHtmlColor)
-
-// darken = function (color) {
-//   return color * #... // check doc stylus
-// }
-
-// //////////////////////////
-
-// // .btn .btnGeneric .pageHtml
-// .btnGeneric
-//   padding 5px
-
-// .pageHtml
-//   background-color pageHtmlColor
-//   color white
-//   &:hover
-//     color pageHtmlColor-hover