Refactor: Replace sidebar with horizontal navigation bar

- Remove sidebar and toggle functionality
- Add Bootstrap navbar with dropdown menus
- Move navigation to top between header and content
- Update menu rendering for Bootstrap dropdowns
- Clean up unused files (header.mustache, sidebar.mustache, sidebar.js)
- Add guide link with book icon in footer
- Simplify layout structure
- Remove duplicate code and fix syntax errors
- Add .gitignore for node_modules and other temp files

vendor/composer/installed.php

@@ -0,0 +1,32 @@
+<?php return array(
+    'root' => array(
+        'name' => '__root__',
+        'pretty_version' => 'dev-main',
+        'version' => 'dev-main',
+        'reference' => '0f1c7234b8e213130e58252a3aa58a58290c959e',
+        'type' => 'library',
+        'install_path' => __DIR__ . '/../../',
+        'aliases' => array(),
+        'dev' => true,
+    ),
+    'versions' => array(
+        '__root__' => array(
+            'pretty_version' => 'dev-main',
+            'version' => 'dev-main',
+            'reference' => '0f1c7234b8e213130e58252a3aa58a58290c959e',
+            'type' => 'library',
+            'install_path' => __DIR__ . '/../../',
+            'aliases' => array(),
+            'dev_requirement' => false,
+        ),
+        'mustache/mustache' => array(
+            'pretty_version' => 'v3.0.0',
+            'version' => '3.0.0.0',
+            'reference' => '176b6b21d68516dd5107a63ab71b0050e518b7a4',
+            'type' => 'library',
+            'install_path' => __DIR__ . '/../mustache/mustache',
+            'aliases' => array(),
+            'dev_requirement' => false,
+        ),
+    ),
+);