feat: add sidebar and item list to catalog page, enable DEBUG mode for development

- Created `side-bar.html` and `item-list.html` fragments for catalog page layout
- Updated `catalog/index.html` to include sidebar and item list templates
- Added styles for catalog layout in `catalog.css`
- Enabled `DEBUG=True` in settings for local development
- Adjusted CSS in shipping and services for consistent spacing

templates/catalog/index.html

@@ -10,10 +10,18 @@
 {% block content %}
     <!-- HEADER -->
     {% include "_fragments/header.html" with active="catalog" %}
+
     {% if selected_category.id == None %}
         {% include '_fragments/breadcrumbs.html' with url_1='/' text_1='Главная' url_2='/catalog/' text_2='Каталог' %}
     {% else %}
         {% include '_fragments/breadcrumbs.html' with url_1='/' text_1='Главная' url_2='/catalog/' text_2='Каталог' text_3=selected_category.name %}
     {% endif %}
+
+    <div class="container catalog-container">
+        {% include 'catalog/_fragments/side-bar.html' with categories=categories %}
+
+        {% include 'catalog/_fragments/item-list.html' with items=items %}
+    </div>
+
     {% include "_fragments/footer.html" %}
 {% endblock %}