fix: disable about.njk completely with permalink: false

Set permalink: false directly in frontmatter to ensure the template
never renders. Users should create their own about page via
post-type-page plugin.

Removed about.11tydata.js as it's no longer needed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

about.11tydata.js

@@ -1,21 +0,0 @@
-// Template data file for about.njk
-// Dynamically sets permalink based on whether about.md exists in content/pages/
-import { existsSync } from "fs";
-import { resolve, dirname } from "path";
-import { fileURLToPath } from "url";
-
-const __dirname = dirname(fileURLToPath(import.meta.url));
-
-export default function() {
-  // Check for about.md in content/pages/ directory
-  const aboutPath = resolve(__dirname, "content/pages/about.md");
-  const aboutExists = existsSync(aboutPath);
-
-  return {
-    // If about.md exists, disable this template's permalink
-    // If not, use /about/ as the permalink
-    permalink: aboutExists ? false : "/about/",
-    // Also exclude from collections if about.md exists
-    eleventyExcludeFromCollections: aboutExists
-  };
-}

about.njk

@@ -1,6 +1,8 @@
 ---
 layout: layouts/base.njk
 title: About
+permalink: false
+eleventyExcludeFromCollections: true
 ---
 <article class="h-card">
   <header class="mb-6 sm:mb-8 flex flex-col sm:flex-row gap-6 sm:gap-8 items-start">