chore: remove click outside mixin

src/mixins/click-outside.js

@@ -1,31 +0,0 @@
-/**
- * Listen to click outside event
- */
-import { on, off } from '../utils/dom/event';
-
-export const ClickOutsideMixin = (config) => ({
-  props: {
-    closeOnClickOutside: {
-      type: Boolean,
-      default: true,
-    },
-  },
-
-  data() {
-    const clickOutsideHandler = (event) => {
-      if (this.closeOnClickOutside && !this.$el.contains(event.target)) {
-        this[config.method]();
-      }
-    };
-
-    return { clickOutsideHandler };
-  },
-
-  mounted() {
-    on(document, config.event, this.clickOutsideHandler);
-  },
-
-  beforeUnmount() {
-    off(document, config.event, this.clickOutsideHandler);
-  },
-});