chore: add bit sponsor placement

docs/.vuepress/components/Bit.vue

@@ -0,0 +1,25 @@
+<template>
+  <p class="bit-sponsor">
+    <a href="https://www.bitsrc.io/?utm_source=vue&utm_medium=vue&utm_campaign=vue&utm_term=vue&utm_content=vue" target="_blank">
+      <span>This project is sponsored by</span>
+      <img alt="bit" src="https://raw.githubusercontent.com/vuejs/vuejs.org/master/themes/vue/source/images/bit.png">
+    </a>
+  </p>
+</template>
+
+<style lang="stylus">
+.bit-sponsor
+  font-weight 600
+  background-color #f3f6f8
+  padding 0.6em 1.2em
+  border-radius 8px
+  display inline-block
+  margin 1em 0 !important
+  a
+    color #999
+  img
+    height 40px
+    margin-left 15px
+  img, span
+    vertical-align middle
+</style>

docs/config/README.md

@@ -4,6 +4,8 @@ sidebar: auto
 
 # Configuration Reference
 
+<Bit/>
+
 ## Global CLI Config
 
 Some global configurations for `@vue/cli`, such as your preferred package manager and your locally saved presets, are stored in a JSON file named `.vuerc` in your home directory. You can edit this file directory with your editor of choice to change the saved options.

docs/guide/README.md

@@ -4,6 +4,8 @@ sidebarDepth: 0
 
 # Overview
 
+<Bit/>
+
 Vue CLI is a full system for rapid Vue.js development, providing:
 
 - Interactive project scaffolding via `@vue/cli`.