chore(blog): remove the blog listing page

It isn't being updated and I want to focus on the daily email archive
list.

src/layouts/Layout.astro

@@ -19,10 +19,6 @@ const footerLinks = [
     title: "About",
     href: "/",
   },
-  {
-    title: "Blog",
-    href: "/blog",
-  },
   {
     title: "Talks",
     href: "/talks",

src/pages/blog/index.astro

@@ -1,32 +0,0 @@
----
-import ListingPage from "~/components/ListingPage.astro";
-import PageLayout from "~/layouts/PageLayout.astro";
-import { getCollection } from 'astro:content';
-
-const posts = await getCollection('blog');
-
-// TODO: show all posts when running locally.
-const filteredPosts = posts
-  .filter((post) => !post.data.draft)
-  .filter((post) => post.data.date);
-
-const sortedPosts = filteredPosts
-  .map((post) => {
-    const slug = `/blog/${post.slug}`;
-
-    return { item: post, slug };
-  })
-  .sort(
-    (a, b) =>
-      new Date(b.item.data.date).valueOf() -
-      new Date(a.item.data.date).valueOf()
-  );
----
-
-<ListingPage items={sortedPosts} title="Blog">
-  <p slot="intro">
-    This is where I publish my personal blog posts as well as technical posts
-    and tutorials on topics such as Drupal, PHP, Tailwind CSS, automated
-    testing, and systems administration.
-  </p>
-</ListingPage>