docs: refactor Overview into several files (#8543)

docs/products/prowler-app.md

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+Prowler App is a web application that simplifies running Prowler. It provides:
+
+- **User-friendly interface** for configuring and executing scans
+- Dashboard to **view results** and manage **security findings**
+
+![Prowler App](img/overview.png)
+
+## Components
+
+Prowler App consists of three main components:
+
+- **Prowler UI**: User-friendly web interface for running Prowler and viewing results, powered by Next.js
+- **Prowler API**: Backend API that executes Prowler scans and stores results, built with Django REST Framework
+- **Prowler SDK**: Python SDK that integrates with Prowler CLI for advanced functionality
+
+Supporting infrastructure includes:
+
+- **PostgreSQL**: Persistent storage of scan results
+- **Celery Workers**: Asynchronous execution of Prowler scans
+- **Valkey**: In-memory database serving as message broker for Celery workers
+
+![Prowler App Architecture](img/prowler-app-architecture.png)

docs/products/prowler-cli.md

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+Prowler CLI is a command-line interface for running Prowler scans from the terminal.
+
+```console
+prowler <provider>
+```
+![Prowler CLI Execution](../img/short-display.png)
+
+## Prowler Dashboard
+
+```console
+prowler dashboard
+```
+![Prowler Dashboard](img/dashboard.png)
+
+Prowler includes hundreds of security controls aligned with widely recognized industry frameworks and standards, including:
+
+- CIS Benchmarks (AWS, Azure, Microsoft 365, Kubernetes, GitHub)
+- NIST SP 800-53 (rev. 4 and 5) and NIST SP 800-171
+- NIST Cybersecurity Framework (CSF)
+- CISA Guidelines
+- FedRAMP Low & Moderate
+- PCI DSS v3.2.1 and v4.0
+- ISO/IEC 27001:2013 and 2022
+- SOC 2
+- GDPR (General Data Protection Regulation)
+- HIPAA (Health Insurance Portability and Accountability Act)
+- FFIEC (Federal Financial Institutions Examination Council)
+- ENS RD2022 (Spanish National Security Framework)
+- GxP 21 CFR Part 11 and EU Annex 11
+- RBI Cybersecurity Framework (Reserve Bank of India)
+- KISA ISMS-P (Korean Information Security Management System)
+- MITRE ATT&CK
+- AWS Well-Architected Framework (Security & Reliability Pillars)
+- AWS Foundational Technical Review (FTR)
+- Microsoft NIS2 Directive (EU)
+- Custom threat scoring frameworks (prowler_threatscore)
+- Custom security frameworks for enterprise needs