fix: Wrong link, remobe "/docs" that link to installation page.

docs/src/introduction.njk

@@ -46,7 +46,7 @@ toc:
 
   <p>There's also a CLI to help you scaffold components and get set up fast.</p>
 
-  <p><a href="/docs/installation">Check out the installation guide</a> to get started.</p>
+  <p><a href="/installation">Check out the installation guide</a> to get started.</p>
 </div>
 
 <h2 id="how-can-i-help"><a href="#how-can-i-help">How can I help?</a></h2>
@@ -60,4 +60,4 @@ toc:
     <li><a href="https://github.com/hunvreus/basecoat/pulls">Submit a pull request</a></li>
     <li><a href="https://github.com/sponsors/hunvreus">Sponsor the project</a></li>
   </ul>
-</div>
+</div>