feat(website): add GitHub nav link and git clone to quick start

- Add GitHub link to nav bar on both index and docs pages
- Add git clone + cd commands to Quick Start terminal block

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/website/docs.html

@@ -63,6 +63,7 @@
         <a href="index.html" class="nav-link">Home</a>
         <a href="index.html#features" class="nav-link">Features</a>
         <a href="docs.html" class="nav-link nav-link--active">Docs</a>
+        <a href="https://github.com/staack/the-other-dude" class="nav-link" rel="noopener">GitHub</a>
       </div>
     </div>
   </nav>

docs/website/index.html

@@ -95,6 +95,7 @@
         <a href="#architecture" class="nav-link">Architecture</a>
         <a href="#screenshots" class="nav-link">Screenshots</a>
         <a href="docs.html" class="nav-link">Docs</a>
+        <a href="https://github.com/staack/the-other-dude" class="nav-link" rel="noopener">GitHub</a>
         <a href="docs.html#quickstart" class="nav-cta">Get Started</a>
       </div>
     </div>
@@ -418,7 +419,11 @@
           <span class="code-dot code-dot--green"></span>
           <span class="code-window-title">Terminal</span>
         </div>
-        <pre class="code-window-body"><code><span class="code-comment"># Clone and configure</span>
+        <pre class="code-window-body"><code><span class="code-comment"># Clone the repo</span>
+<span class="code-cmd">git clone https://github.com/staack/the-other-dude.git</span>
+<span class="code-cmd">cd the-other-dude</span>
+
+<span class="code-comment"># Configure</span>
 <span class="code-cmd">cp .env.example .env</span>
 
 <span class="code-comment"># Start infrastructure</span>