```

chore: enhance .gitignore and remove obsolete documentation files

- Reorganize .gitignore with categorized sections for better maintainability
- Add comprehensive ignore patterns for Python, Node.js, databases, logs, and build artifacts
- Add project-specific ignore rules for coordinator, explorer, and deployment files
- Remove outdated documentation: BITCOIN-WALLET-SETUP.md, LOCAL_ASSETS_SUMMARY.md, README-CONTAINER-DEPLOYMENT.md, README-DOMAIN-DEPLOYMENT.md
```

website/docs/js/theme.js

@@ -0,0 +1,54 @@
+/**
+ * AITBC Documentation Theme Toggle
+ * Handles dark/light mode switching with localStorage persistence
+ */
+
+(function() {
+    'use strict';
+
+    const STORAGE_KEY = 'aitbc-docs-theme';
+    
+    // Initialize theme on page load
+    function initTheme() {
+        const savedTheme = localStorage.getItem(STORAGE_KEY);
+        const themeToggle = document.getElementById('theme-toggle');
+        
+        if (savedTheme === 'light') {
+            document.body.classList.add('light');
+            if (themeToggle) {
+                themeToggle.innerHTML = '<i class="fas fa-moon"></i>';
+            }
+        }
+        
+        // Setup toggle button listener
+        if (themeToggle) {
+            themeToggle.addEventListener('click', toggleTheme);
+        }
+    }
+    
+    // Toggle between light and dark themes
+    function toggleTheme() {
+        const themeToggle = document.getElementById('theme-toggle');
+        document.body.classList.toggle('light');
+        
+        const isLight = document.body.classList.contains('light');
+        
+        if (themeToggle) {
+            themeToggle.innerHTML = isLight 
+                ? '<i class="fas fa-moon"></i>' 
+                : '<i class="fas fa-sun"></i>';
+        }
+        
+        localStorage.setItem(STORAGE_KEY, isLight ? 'light' : 'dark');
+    }
+    
+    // Run on DOM ready
+    if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', initTheme);
+    } else {
+        initTheme();
+    }
+    
+    // Expose for manual use if needed
+    window.toggleTheme = toggleTheme;
+})();