Code refactoring (#2785)

* chore: pretty theme menu in sidebar

* refactor: renaming component templates

* refactor: create custom `a-statistic` component

* fix: display button text only on large screens

* chore: remove loading background in overview page

* fix: show `Version` text when xray version is unknown

web/html/xui/component/aPasswordInput.html

@@ -0,0 +1,57 @@
+{{define "component/passwordInput"}}
+<template>
+  <a-input :value="value" :type="showPassword ? 'text' : 'password'" :placeholder="placeholder"
+    :autocomplete="autocomplete" :name="name" @input="$emit('input', $event.target.value)">
+    <template v-if="icon" #prefix>
+      <a-icon :type="icon" style="font-size: 16px;" />
+    </template>
+    <template #addonAfter>
+      <a-icon :type="showPassword ? 'eye-invisible' : 'eye'" @click="toggleShowPassword" style="font-size: 16px;" />
+    </template>
+  </a-input>
+</template>
+{{end}}
+
+{{define "component/aPasswordInput"}}
+<script>
+  Vue.component('a-password-input', {
+    props: {
+      'title': {
+        type: String,
+        required: false,
+      },
+      'value': {
+        type: String,
+        required: false,
+      },
+      'placeholder': {
+        type: String,
+        required: false,
+      },
+      'autocomplete': {
+        type: String,
+        required: false,
+      },
+      'name': {
+        type: String,
+        required: false,
+      },
+      'icon': {
+        type: undefined,
+        required: false
+      }
+    },
+    template: `{{template "component/passwordInput"}}`,
+    data() {
+      return {
+        showPassword: false,
+      };
+    },
+    methods: {
+      toggleShowPassword() {
+        this.showPassword = !this.showPassword;
+      },
+    },
+  });
+</script>
+{{end}}