Merge branch 'master' into 'master'

更新explore/index.yml

See merge request codechina/operation-work!4

explore/index.yml

 banner: 
-  - url: 'http://local-code.csdn.net:3000/assets/about/banner_1-fcc9abe35abd3bf964dbabec547d9c706596839c2ed0ec4eff6a859f7af1c629.jpg'
+  - url: 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1604316953273&di=a9f4934761834a0a4d2af3c944b4780a&imgtype=0&src=http%3A%2F%2Fbpic.588ku.com%2Fback_pic%2F00%2F04%2F09%2F7856210b54e23bd.jpg'
     link: 'http://www.baidu.com' 
 trending_words: 
   - content: 'ruby on rails'