Refactor CSS styles and update HTML structure for improved layout and responsiveness

- Updated padding values for sections in custom CSS files to enhance spacing.
- Introduced new card styles with hover effects for better user interaction.
- Added new gradient card layout in the chill theme for a visually appealing design.
- Removed obsolete sector layout and replaced it with a more flexible gradient card layout.
- Enhanced feature list layout with improved pagination and sidebar integration.
- Created a new shortcode for gradient card sections to streamline feature presentation.

themes/chill-theme/layouts/shortcodes/gradient-card-section.html

@@ -0,0 +1,17 @@
+{{/* Features Section Wrapper Shortcode */}}
+{{ $title := .Get "title" | default "Powerful Features for Modern Teams" }}
+{{ $description := .Get "description" | default "Discover how our platform helps you understand and optimize every aspect of your user experience." }}
+
+<section class="section">
+    <div class="container">
+        <div class="text-center max-w-3xl mx-auto mb-8">
+            <h2 class="text-3xl md:text-4xl font-bold mb-6">{{ $title }}</h2>
+            <p class="text-xl text-gray-600">{{ $description | markdownify }}</p>
+        </div>
+
+        <!-- Feature Grid -->
+        <div class="text-center max-w-3xl mx-auto mb-8">
+            {{ .Inner | safeHTML  }}
+        </div>
+    </div>
+</section>