chore: delete `display.css`

these styles are not used anywhere

web/assets/element-ui/theme-chalk/display.css

@@ -1 +0,0 @@
-@media only screen and (max-width:767px){.hidden-xs-only{display:none!important}}@media only screen and (min-width:768px){.hidden-sm-and-up{display:none!important}}@media only screen and (min-width:768px) and (max-width:991px){.hidden-sm-only{display:none!important}}@media only screen and (max-width:991px){.hidden-sm-and-down{display:none!important}}@media only screen and (min-width:992px){.hidden-md-and-up{display:none!important}}@media only screen and (min-width:992px) and (max-width:1199px){.hidden-md-only{display:none!important}}@media only screen and (max-width:1199px){.hidden-md-and-down{display:none!important}}@media only screen and (min-width:1200px){.hidden-lg-and-up{display:none!important}}@media only screen and (min-width:1200px) and (max-width:1919px){.hidden-lg-only{display:none!important}}@media only screen and (max-width:1919px){.hidden-lg-and-down{display:none!important}}@media only screen and (min-width:1920px){.hidden-xl-only{display:none!important}}

web/html/common/head.html

@@ -5,7 +5,6 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <link rel="stylesheet" href="{{ .base_path }}assets/ant-design-vue/antd.min.css">
-  <link rel="stylesheet" href="{{ .base_path }}assets/element-ui/theme-chalk/display.css">
   <link rel="stylesheet" href="{{ .base_path }}assets/css/custom.min.css?{{ .cur_ver }}">
   <style>
     [v-cloak] {