Update Dockerfile to disable AllowOverride for production, enhance admin.php to handle missing FLIXCOOKS_ADMIN_KEY with a user-friendly error page, and remove .htaccess file. Adjust documentation to reflect these changes and clarify admin key configuration.

Dockerfile

@@ -7,13 +7,13 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     && a2enmod rewrite headers \
     && rm -rf /var/lib/apt/lists/*
 
-# Apache: document root + AllowOverride for .htaccess
+# Apache: document root, no per-directory overrides in production
 ENV APACHE_DOCUMENT_ROOT=/var/www/html
 RUN sed -ri 's!/var/www/html!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/sites-available/*.conf \
     && sed -ri 's!/var/www/!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/apache2.conf /etc/apache2/conf-available/*.conf \
     && printf '%s\n' \
         '<Directory /var/www/html>' \
-        '    AllowOverride All' \
+        '    AllowOverride None' \
         '    Require all granted' \
         '</Directory>' \
         > /etc/apache2/conf-available/flixcooks.conf \