restore legacy 301 redirects (graphql#1503)

Author: acao

gatsby-node.ts

@@ -4,6 +4,7 @@ import { glob } from "glob"
 import { updateCodeData } from "./scripts/update-code-data/update-code-data"
 import { organizeCodeData } from "./scripts/update-code-data/organize-code-data"
 import { sortCodeData } from "./scripts/update-code-data/sort-code-data"
+import redirects from "./redirects.json"
 
 export const createSchemaCustomization: GatsbyNode["createSchemaCustomization"] =
   async ({ actions }) => {
@@ -128,6 +129,15 @@ export const createPages: GatsbyNode["createPages"] = async ({
     statusCode: 200,
   })
 
+  // legacy 301 redirects from previous iterations of the site
+  redirects.forEach(({ from, to }) => {
+    createRedirect({
+      fromPath: from,
+      toPath: to,
+      statusCode: 301,
+    })
+  })
+
   const result = await graphql(`
     query allMarkdownRemark {
       allMarkdownRemark {

redirects.json

@@ -0,0 +1,66 @@
+[
+  {
+    "from": "/docs/api-reference-errors",
+    "to": "/graphql-js/error/"
+  },
+  {
+    "from": "/docs/api-reference-execution",
+    "to": "/graphql-js/execution/"
+  },
+  {
+    "from": "/docs/api-reference-express-graphql",
+    "to": "/graphql-js/express-graphql/"
+  },
+  {
+    "from": "/docs/api-reference-graphql",
+    "to": "/graphql-js/graphql/"
+  },
+  {
+    "from": "/docs/api-reference-language",
+    "to": "/graphql-js/language/"
+  },
+  {
+    "from": "/docs/api-reference-type-system",
+    "to": "/graphql-js/type/"
+  },
+  {
+    "from": "/docs/api-reference-type-utilities",
+    "to": "/graphql-js/utilities/"
+  },
+  {
+    "from": "/docs/api-reference-type-validation",
+    "to": "/graphql-js/validation/"
+  },
+  {
+    "from": "/docs/getting-started",
+    "to": "/learn/"
+  },
+  {
+    "from": "/docs/intro",
+    "to": "/learn/"
+  },
+  {
+    "from": "/docs/introspection",
+    "to": "/learn/introspection/"
+  },
+  {
+    "from": "/docs/queries",
+    "to": "/learn/queries/"
+  },
+  {
+    "from": "/docs/typesystem",
+    "to": "/learn/schema/"
+  },
+  {
+    "from": "/docs/validation",
+    "to": "/learn/validation/"
+  },
+  {
+    "from": "/docs/videos",
+    "to": "/community/#videos/"
+  },
+  {
+    "from": "/help",
+    "to": "/community/"
+  }
+]