feat(404): add collections 404 page to tech spotlights

src/pages/archives/index.tsx

@@ -0,0 +1,20 @@
+import React, { Fragment } from "react"
+
+import { Link } from "../../components/Link"
+import { SEO } from "../../components/SEO"
+
+function ArchivesPage() {
+  return (
+    <Fragment>
+      <SEO title="Tech Spotlights Archives" />
+      <p>Welcome to the TPH tech spotlights archives.</p>
+      <p>
+        This regroups the archives of our occasional, temporary channels that
+        cover a piece of technology that might be unknown to part of our users.
+        You can find those on <Link to="/about">The Programmer's Hangout</Link>.
+      </p>
+    </Fragment>
+  )
+}
+
+export default ArchivesPage