fix: fix page & post issues

gatsby-node.ts

@@ -0,0 +1,61 @@
+import path from "path";
+import type { GatsbyNode } from "gatsby"
+
+export const createPages: GatsbyNode["createPages"] = async ({
+  graphql,
+  actions,
+  /* createNodeId,
+  createContentDigest, */
+}) => {
+  const { createPage } = actions
+
+  const results = await graphql<any>(`
+    query {
+      allMdx {
+        edges {
+          node {
+            slug
+            fields {
+              source
+            }
+          }
+        }
+      }
+    }
+  `)
+
+  const allEdges: any[] = results.data.allMdx.edges
+
+  const blogEdges = allEdges.filter(
+    (edge) => edge.node.fields.source === "posts"
+  )
+  const pageEdges = allEdges.filter(
+    (edge) => edge.node.fields.source === "pages"
+  )
+
+  blogEdges.forEach((edge, index) => {
+    const previous =
+      index === blogEdges.length - 1 ? null : blogEdges[index + 1].node
+    const next = index === 0 ? null : blogEdges[index - 1].node
+
+    createPage({
+      path: `/blog/${edge.node.slug}`,
+      component: path.resolve("./src/layouts/Post.tsx"),
+      context: {
+        slug: edge.node.slug,
+        previous,
+        next
+      }
+    })
+  })
+
+  pageEdges.forEach((edge, index) => {
+    createPage({
+      path: `/${edge.node.slug}`,
+      component: path.resolve("./src/layouts/Page.tsx"),
+      context: {
+        slug: edge.node.slug
+      }
+    })
+  })
+}