don't hardcode styles to present, use config

now that we can override the styles in practice, we also need to only
present what is possible in the HTML

incorporealcms/lib.py

@@ -39,6 +39,7 @@ def render(template_name_or_list, **context):
         user_style = request.cookies.get('user-style')
         logger.debug("user style cookie: %s", user_style)
     context['user_style'] = page_styles.get(user_style, page_styles.get(app.config['DEFAULT_PAGE_STYLE']))
+    context['page_styles'] = page_styles
 
     resp = make_response(render_template(template_name_or_list, **context))
     if selected_style:

incorporealcms/templates/base.html

@@ -20,9 +20,9 @@
             {% endfor %}
         </div>
         <div class="styles">
-            <a href="?style=dark">[dark]</a>
-            <a href="?style=light">[light]</a>
-            <a href="?style=plain">[plain]</a>
+            {% for style in page_styles %}
+            <a href="?style={{ style }}">[{{ style }}]</a>
+            {% endfor %}
         </div>
     </div>
     {% endblock %}