docs: move MailOps webhook handover document to the docs directory

Dockerfile

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+FROM php:8.4-fpm
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    git \
+    curl \
+    libpng-dev \
+    libonig-dev \
+    libxml2-dev \
+    zip \
+    unzip \
+    nginx \
+    supervisor \
+    libc-client-dev \
+    libkrb5-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Configure and install PHP extensions
+RUN docker-php-ext-configure imap --with-kerberos --with-imap-ssl \
+    && docker-php-ext-install pdo_mysql mbstring exif pcntl bcmath gd intl imap \
+    && pecl install redis \
+    && docker-php-ext-enable redis
+
+# Install Composer
+COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
+
+# Set working directory
+WORKDIR /var/www
+
+# Copy existing application directory contents
+COPY . /var/www
+
+# Install PHP dependencies
+RUN composer install --no-interaction --no-dev --optimize-autoloader
+
+# Nginx config
+COPY .docker/nginx.conf /etc/nginx/sites-available/default
+RUN rm -rf /etc/nginx/sites-enabled/default && ln -s /etc/nginx/sites-available/default /etc/nginx/sites-enabled/default
+
+# Supervisor config
+COPY .docker/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+
+# Set directory permissions
+RUN chown -R www-data:www-data /var/www/storage /var/www/bootstrap/cache \
+    && chmod -R 775 /var/www/storage /var/www/bootstrap/cache
+
+# Build frontend assets
+RUN curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
+    && apt-get install -y nodejs \
+    && npm install \
+    && npm run build \
+    && apt-get remove -y nodejs \
+    && apt-get autoremove -y
+
+EXPOSE 80
+
+# Configure entrypoint
+COPY .docker/entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+# Start Supervisor
+CMD ["/usr/local/bin/entrypoint.sh"]