Add docs, blog, community pages and polish landing page layout

- Add docs pages (getting-started, changelog, keyboard-shortcuts)
- Add blog, community, and legal pages (privacy, terms, EULA)
- Add site header, footer, download button, and nav components
- Add sitemap and robots.txt generation
- Narrow main page container (max-w-2xl), fix footer positioning
- Switch README feature list to colon style

web/app/docs/getting-started/page.tsx

@@ -0,0 +1,77 @@
+import type { Metadata } from "next";
+import { CodeBlock } from "../../components/code-block";
+import { Callout } from "../../components/callout";
+import { DownloadButton } from "../../components/download-button";
+
+export const metadata: Metadata = {
+  title: "Getting Started",
+  description: "Install and set up cmux on macOS",
+};
+
+export default function GettingStartedPage() {
+  return (
+    <>
+      <h1>Getting Started</h1>
+      <p>
+        cmux is a lightweight, native macOS terminal built on Ghostty for
+        managing multiple AI coding agents. It features vertical tabs, a
+        notification panel, and a socket-based control API.
+      </p>
+
+      <h2>Install</h2>
+
+      <h3>DMG (recommended)</h3>
+      <div className="my-4">
+        <DownloadButton />
+      </div>
+      <p>
+        Open the <code>.dmg</code> and drag cmux to your Applications folder.
+        cmux auto-updates via Sparkle, so you only need to download once.
+      </p>
+
+      <h3>Homebrew</h3>
+      <CodeBlock lang="bash">{`brew tap manaflow-ai/cmux
+brew install --cask cmux`}</CodeBlock>
+      <p>To update later:</p>
+      <CodeBlock lang="bash">{`brew upgrade --cask cmux`}</CodeBlock>
+
+      <Callout>
+        On first launch, macOS may ask you to confirm opening an app from an
+        identified developer. Click <strong>Open</strong> to proceed.
+      </Callout>
+
+      <h2>Verify installation</h2>
+      <p>Open cmux and you should see:</p>
+      <ul>
+        <li>A terminal window with a vertical tab sidebar on the left</li>
+        <li>One initial workspace already open</li>
+        <li>The Ghostty-powered terminal ready for input</li>
+      </ul>
+
+      <h2>CLI setup</h2>
+      <p>
+        cmux includes a command-line tool for automation. Inside cmux terminals
+        it works automatically. To use the CLI from outside cmux, create a
+        symlink:
+      </p>
+      <CodeBlock lang="bash">{`sudo ln -sf "/Applications/cmux.app/Contents/MacOS/cmux" /usr/local/bin/cmux`}</CodeBlock>
+      <p>Then you can run commands like:</p>
+      <CodeBlock lang="bash">{`cmux list-workspaces
+cmux notify --title "Build Complete" --body "Your build finished"`}</CodeBlock>
+
+      <h2>Auto-updates</h2>
+      <p>
+        cmux checks for updates automatically via Sparkle. When an update is
+        available you&apos;ll see an update pill in the titlebar. You can also
+        check manually via <strong>cmux → Check for Updates</strong> in the menu
+        bar.
+      </p>
+
+      <h2>Requirements</h2>
+      <ul>
+        <li>macOS 14.0 or later</li>
+        <li>Apple Silicon or Intel Mac</li>
+      </ul>
+    </>
+  );
+}