Update to Eleventy v3 and update Eleventy plugin

eleventy.config.js

@@ -0,0 +1,45 @@
+import govukEleventyPlugin from "@x-govuk/govuk-eleventy-plugin";
+
+export default function (eleventyConfig) {
+  // Register the plugin
+  eleventyConfig.addPlugin(govukEleventyPlugin, {
+    icons: {
+      mask: "https://raw.githubusercontent.com/x-govuk/logo/main/images/x-govuk-mask-icon.svg?raw=true",
+      shortcut:
+        "https://raw.githubusercontent.com/x-govuk/logo/main/images/x-govuk-favicon.ico",
+      touch:
+        "https://raw.githubusercontent.com/x-govuk/logo/main/images/x-govuk-apple-touch-icon.png",
+    },
+    url: process.env.GITHUB_ACTIONS
+      ? "https://x-govuk.github.io/govuk-rspec-helpers/"
+      : "/",
+    header: {
+      logotype: "x-govuk",
+    },
+    titleSuffix: "X-GOVUK",
+    footer: {
+      contentLicence: {
+        html: 'Licensed under the <a class="govuk-footer__link" href="https://github.com/x-govuk/govuk-prototype-components/blob/main/LICENSE.txt">MIT Licence</a>, except where otherwise stated',
+      },
+      copyright: {
+        text: "© X-GOVUK",
+      },
+    },
+  });
+
+  // Passthrough
+  eleventyConfig.addPassthroughCopy("./assets");
+
+  return {
+    dataTemplateEngine: "njk",
+    htmlTemplateEngine: "njk",
+    markdownTemplateEngine: "njk",
+    dir: {
+      // Use layouts from the plugin
+      layouts: "node_modules/@x-govuk/govuk-eleventy-plugin/layouts",
+    },
+    pathPrefix: process.env.GITHUB_ACTIONS
+      ? "/govuk-services-frontend-stats/"
+      : "/",
+  };
+}