refactor: redesign home page, remove old video pages, migrate to @tailwindcss/typography

- Replace root page with new (home) route featuring a project showcase (Domainstack, Sofa, Versioneer, Snoozle)
- Remove /birthday and /hillary video pages
- Replace custom hand-rolled .prose styles with @tailwindcss/typography via a .markdown utility class
- Remove heading-anchor component and .nvmrc

app/notes/[slug]/page.tsx

@@ -179,7 +179,9 @@ const Page = async ({ params }: { params: Promise<{ slug: string }> }) => {
         />
       </h1>
 
-      <MDXContent />
+      <article className="markdown">
+        <MDXContent />
+      </article>
 
       <section id="comments" className="isolate my-8 w-full border-t-2 pt-8">
         <div className="mx-auto w-full max-w-3xl space-y-6">