Add docs page

Author: justinfagnani

packages/site-content/site/_includes/layouts/docs.11ty.cjs

@@ -0,0 +1,24 @@
+/**
+ * @license
+ * Copyright 2022 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+module.exports = {
+  async render(data) {
+    const {renderPage, html, unsafeHTML} = await import(
+      '../../../templates/lib/base.js'
+    );
+    await import('@webcomponents/internal-site-client/lib/components/wco-nav-page.js');
+
+    // URL isn't exactly a Location, but it's close enough for read-only uses
+    window.location = new URL('http://localhost:5450/docs/');
+
+    return [
+      ...renderPage({
+        ...data,
+        content: html`<wco-nav-page>${unsafeHTML(data.content)}</wco-nav-page>`,
+      }),
+    ].join('');
+  },
+};

packages/site-content/site/docs/docs.json

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+{
+  "layout": "layouts/docs.11ty.cjs",
+  "scripts": [
+    "../js/homepage.js"
+  ]
+}

packages/site-content/site/docs/index.md

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+---
+title: 'Web Components | Docs'
+---
+# Introduction to Web Components
+
+_TODO_: Welcome to the webcomponents.org docs...
+
+## What are web components?
+
+_TODO_
+
+## Why are web components?
+
+_TODO_
+
+## How to web components?
+
+_TODO_