fix: Resolve layout and design issues

- Remove logo from header navbar
- Fix Back to Top button centering with flexbox
- Fix Storage Providers duplicate CSS
- Optimize content area for full-width layout
- Improve overall visual consistency

Author: byerlikaya

docs/_layouts/default.html

@@ -84,7 +84,6 @@
     <nav class="navbar navbar-expand-lg navbar-dark fixed-top">
         <div class="container">
             <a class="navbar-brand" href="{{ site.baseurl }}/{{ site.languages_default }}">
-                <i class="fas fa-brain me-2"></i>
                 <span class="brand-text">SmartRAG</span>
             </a>
 
@@ -141,23 +140,23 @@
         </div>
     </nav>
 
-    <!-- Main Content -->
-    <main class="main-content">
-        <div class="container">
-            <div class="content-wrapper">
-                <div class="page-header">
-                    <h1 class="page-title">{{ page.title }}</h1>
-                    {% if page.description %}
-                    <p class="page-description">{{ page.description }}</p>
-                    {% endif %}
-                </div>
-                
-                <div class="page-content">
-                    {{ content }}
+            <!-- Main Content -->
+        <main class="main-content">
+            <div class="container-fluid">
+                <div class="content-wrapper">
+                    <div class="page-header">
+                        <h1 class="page-title">{{ page.title }}</h1>
+                        {% if page.description %}
+                        <p class="page-description">{{ page.description }}</p>
+                        {% endif %}
+                    </div>
+                    
+                    <div class="page-content">
+                        {{ content }}
+                    </div>
                 </div>
             </div>
-        </div>
-    </main>
+        </main>
 
     <!-- Footer -->
     <footer class="footer">

docs/assets/css/style.css

@@ -275,11 +275,21 @@ body {
     box-shadow: var(--shadow);
     border: 1px solid var(--border-color);
     margin-top: 2rem;
+    width: 100%;
+    max-width: 100%;
 }
 
-/* Content Area - Full Width */
 .content-area {
     padding: 2rem;
+    width: 100%;
+    max-width: 100%;
+}
+
+.main-content {
+    margin-top: 80px;
+    min-height: calc(100vh - 80px);
+    width: 100%;
+    max-width: 100%;
 }
 
 .page-header {
@@ -409,6 +419,10 @@ body {
     visibility: hidden;
     transition: all 0.3s ease;
     z-index: 1000;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 0;
 }
 
 .back-to-top.show {
@@ -421,6 +435,13 @@ body {
     box-shadow: 0 20px 40px rgba(99, 102, 241, 0.3);
 }
 
+.back-to-top i {
+    margin: 0;
+    padding: 0;
+    line-height: 1;
+    display: block;
+}
+
 /* Responsive Design */
 @media (max-width: 991.98px) {
     .content-area {

docs/index.md

@@ -221,7 +221,6 @@ var document = await documentService.UploadDocumentAsync(file);
     </div>
     <div class="col-md-2 mb-3">
         <div class="provider-card text-center p-4">
-            <div class="provider-card text-center p-4">
             <div class="provider-icon">
                 <i class="fas fa-microchip"></i>
             </div>