fix(website/page): correct page link

Author: kubosho

src/_layouts/website/page.html

@@ -52,6 +52,6 @@
 {% endblock %}
 
 {% block book_inner %}
-<a href="/" class="book-title">Steins;Git</a>
+<a href="./" class="book-title">Steins;Git</a>
 {{ super() }}
-{% endblock %}
+{% endblock %}