Remove playground redirect link (#17181)

website/static/playground-redirect.html

@@ -1,35 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Redirecting…</title>
-  </head>
-  <body>
-    <h1>Redirecting…</h1>
-    <p>
-      Redirecting you to the appropriate playground. If the redirect doesn’t
-      work, <a href="javascript:history.back()">go back to the PR</a> and click
-      the appropriate link:<br />
-      <img
-        src="https://cdn.netlify.com/f0b93f3003d5669924b6e73540bbfe07bc3d8d95/34c5d/img/blog/deploy-preview-workflow.gif"
-        alt="click on the link next to 'deploy/netlify'"
-      />
-    </p>
-    <script>
-      const match =
-        /^https:\/\/github\.com\/prettier\/prettier\/pull\/(\d+)/.exec(
-          document.referrer,
-        );
-      if (match != null) {
-        const [, /* url */ pr] = match;
-        location.replace(
-          `https://deploy-preview-${pr}--prettier.netlify.app/playground`,
-        );
-      } else {
-        const el = document.createElement("p");
-        el.textContent = `The referrer URL (${document.referrer}) was not recognized. Sorry :(`;
-        document.body.appendChild(el);
-      }
-    </script>
-  </body>
-</html>