update: add openapi link (#89)

* update: add openapi link

* update labels

---------

Co-authored-by: Yujing Zheng <[email protected]>

Author: Woodii1998

docusaurus.config.js

@@ -95,6 +95,11 @@ const config = {
           },
           { href: 'https://www.coscene.cn', label: '官方网站', position: 'right' },
           { href: 'https://github.com/coscene-io', label: 'GitHub', position: 'right' },
+          {
+            href: 'https://petstore.swagger.io/?url=https://download.coscene.cn/openapi/openapi.yaml',
+            label: 'OpenAPI',
+            position: 'right',
+          },
         ],
       },
       footer: {