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/_fragments/side-bar.html

@@ -0,0 +1,38 @@
+<aside>
+    <section class="categories a-section">
+        <h2>Категории</h2>
+        {% for category in categories %}
+            <a href="/catalog/{{ category.slug }}" class="category">{{ category.name }}</a>
+        {% endfor %}
+    </section>
+
+    <section class="sub-categories a-section">
+        <h2>Подкатегории</h2>
+    </section>
+
+    <form action="">
+        <section class="a-section cost-section">
+            <h2>Стоимость</h2>
+
+        </section>
+
+        <section class="a-section color-section">
+            <h2>Цвет</h2>
+
+        </section>
+
+        <section class="a-section material-section">
+            <h2>Материал</h2>
+
+        </section>
+
+        <section class="a-section promotions-section">
+            <h2>Акции</h2>
+
+        </section>
+
+        <section class="a-section new-section">
+            <h2>Новинки</h2>
+        </section>
+    </form>
+</aside>