add segment for API reference

www/reference/gatsby-config.js

@@ -71,7 +71,15 @@ module.exports = {
       options: {
         output: '/api/sitemap'
       }
-    }
+    },
+    {
+      resolve: `gatsby-plugin-segment-js`,
+      options: {
+        prodKey: process.env.SEGMENT_API_KEY,
+        devKey: process.env.SEGMENT_API_KEY_DEV,
+        trackPage: true,
+      }
+    },
     // `gatsby-plugin-preact`,
     // {
     //   resolve: `gatsby-source-openapi-aggregate`,

www/reference/package.json

@@ -29,6 +29,7 @@
     "gatsby-plugin-preact": "^5.9.0",
     "gatsby-plugin-react-helmet": "^3.3.12",
     "gatsby-plugin-sitemap": "^5.15.0",
+    "gatsby-plugin-segment-js": "^3.7.1",
     "gatsby-plugin-theme-ui": "^0.10.1",
     "gatsby-remark-autolink-headers": "^4.6.0",
     "gatsby-source-filesystem": "^3.9.0",

www/reference/yarn.lock

@@ -5452,6 +5452,11 @@ gatsby-plugin-sitemap@^5.15.0:
     minimatch "^3.1.2"
     sitemap "^7.0.0"
 
+gatsby-plugin-segment-js@^3.7.1:
+  version "3.7.1"
+  resolved "https://registry.yarnpkg.com/gatsby-plugin-segment-js/-/gatsby-plugin-segment-js-3.7.1.tgz#3432d59be0e45ee82f36a42cff060af220a0dd68"
+  integrity sha512-zAsjRrF77Kih7YRUJVp84thnODbzjDE44H6ePtdQfLVyPWiJj3IpS/WAwyRg9Cu3+FciFAT8WEjfJ2I02V0sUw==
+
 gatsby-plugin-theme-ui@^0.10.1:
   version "0.10.1"
   resolved "https://registry.yarnpkg.com/gatsby-plugin-theme-ui/-/gatsby-plugin-theme-ui-0.10.1.tgz#d1ac7f4f1c4bf187694110a8670f0bb3ff470ad2"