Fix admin CSS not loading and quirks mode issues

Fixed multiple issues in admin panel:

1. CSS path: modern-normalize.css → modern-normalize.min.css
   (File is actually named .min.css)

2. Icon path: assets/icon.svg → /assets/admin_favicon.svg
   (Was relative, now absolute; correct filename)

3. Navigation: /admin/list.php → /admin/
   (list.php was renamed to index.php)

4. Short PHP tags: <? → <?php
   (Better compatibility, some servers don't enable short_open_tag)

5. Quirks mode warning was due to CSS not loading, not DOCTYPE
   (DOCTYPE was already present)

Files modified:
- public/admin/inc/head.php (main fixes)
- public/admin/index.php (short tags)
- public/admin/add.php (short tags)
- public/admin/import.php (short tags)

Need to redeploy for production: just deploy

config/bootstrap.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * Simple configuration for website
+ */
+
+// Define application root
+define('APP_ROOT', dirname(__DIR__));
+
+// Database path
+define('DATABASE_PATH', APP_ROOT . '/database/test.db');
+
+// Error reporting
+if (php_sapi_name() === 'cli-server') {
+    // Development mode
+    error_reporting(E_ALL);
+    ini_set('display_errors', '1');
+} else {
+    // Production mode
+    error_reporting(E_ALL);
+    ini_set('display_errors', '0');
+    ini_set('log_errors', '1');
+}
+
+// Simple helper function for including templates
+function include_template($name) {
+    $path = APP_ROOT . '/includes/' . $name;
+    if (file_exists($path)) {
+        include $path;
+    }
+}
+
+// Autoload Composer dependencies if available
+if (file_exists(APP_ROOT . '/vendor/autoload.php')) {
+    require_once APP_ROOT . '/vendor/autoload.php';
+}