docs(README): fix badge and update instruction (#2065)

README.md

@@ -1,6 +1,6 @@
 # Hexo Official Website
-<!-- Markdown snippet -->
-[![Build Status](https://github.com/hexojs/site/workflows/Tester/badge.svg?branch=master)](https://github.com/hexojs/site/actions?query=workflow%3ATester)
+
+[![Tester](https://github.com/hexojs/site/actions/workflows/tester.yml/badge.svg)](https://github.com/hexojs/site/actions/workflows/tester.yml)
 [![Netlify Status](https://api.netlify.com/api/v1/badges/beeb7e86-4485-4381-8529-6b2a92df5dd7/deploy-status)](https://app.netlify.com/sites/hexo-site/deploys)
 
 The website for Hexo.
@@ -10,21 +10,21 @@ The website for Hexo.
 Install dependencies:
 
 ``` bash
-$ git clone https://github.com/hexojs/site.git
-$ cd site
-$ npm install
+git clone https://github.com/hexojs/site.git
+cd site
+npm install
 ```
 
 Generate:
 
 ``` bash
-$ hexo generate
+hexo generate
 ```
 
 Run server:
 
 ``` bash
-$ hexo server
+hexo server
 ```
 
 ## Contributors
@@ -40,6 +40,3 @@ $ hexo server
 ## License
 
 [CC BY 4.0](http://creativecommons.org/licenses/by/4.0/)
-
-[tommy351]: https://github.com/tommy351
-[pinggod]: https://github.com/pinggod