docs: remove mourn

docs/site/desktop.js

@@ -1,3 +0,0 @@
-import mourn from './mourn';
-
-mourn();

docs/site/mobile.js

@@ -1,4 +1,3 @@
-import mourn from './mourn';
 import Vue from 'vue';
 import Locale from '../../src/locale';
 import Lazyload from '../../src/lazyload';
@@ -6,8 +5,6 @@ import { get } from '../../src/utils';
 import { camelize } from '../../src/utils/format/string';
 import enUS from '../../src/locale/lang/en-US';
 
-mourn();
-
 Vue.use(Lazyload, {
   lazyComponent: true,
 });

docs/site/mourn.js

@@ -1,18 +0,0 @@
-export default function () {
-  const now = new Date();
-
-  if (
-    now.getFullYear() === 2020 &&
-    now.getMonth() === 3 &&
-    now.getDate() === 4
-  ) {
-    const filter = `
-    html{
-      filter: grayscale(100%);
-      -webkit-filter: grayscale(100%);
-      -moz-filter: grayscale(100%);
-    }
-  `;
-    document.head.insertAdjacentHTML('beforeend', `<style>${filter}</style>`);
-  }
-}