copy: simplify home and posts headings

app/posts/page.tsx

@@ -9,13 +9,9 @@ export default async function PostsPage() {
   return (
     <main className="mx-auto max-w-5xl px-6 py-12 sm:py-16">
       <header className="mb-10 border-b border-border pb-8">
-        <p className="mb-3 font-mono text-xs uppercase tracking-[0.24em] text-ink-soft">Archive</p>
         <h1 className="heading-xl m-0 text-ink">
           Posts
         </h1>
-        <p className="mt-4 max-w-2xl text-sm leading-6 text-ink-soft sm:text-base">
-          Browse every essay, note, and experiment in one place. Search and tag filters stay local and fast.
-        </p>
       </header>
 
       {posts.length > 0 ? (