This PR adds comprehensive documentation for all software packages supported by DP-GEN, addressing the need for centralized information about available MD engines and first-principles calculation software.

Changes Made

• Added new documentation page: doc/overview/supported-software.md with detailed information about all supported software
• Updated documentation index: Added the new page to doc/index.rst in the Overview section
• Comprehensive coverage: Documents all 13 supported software packages with descriptions, key features, and usage guidelines

Documentation Structure

The new documentation page is organized into clear sections:

Molecular Dynamics (MD) Engines

• LAMMPS: General-purpose materials modeling with deep potential integration
• Amber: Biomolecular simulations with DPRc support for reactive systems
• Calypso: Crystal structure prediction using particle swarm optimization
• Gromacs: High-performance MD simulations optimized for biological systems

First-Principles (FP) Calculation Software

• VASP: Plane-wave DFT calculations widely used in materials science
• Gaussian: Quantum chemistry software for molecular systems
• Siesta: Electronic structure code efficient for large systems (1000+ atoms)
• CP2K: Mixed basis set DFT with linear scaling capabilities
• ABACUS: Versatile DFT package with native ML potential support
• Amber DPRc: Specialized interface for reactive force field simulations
• PWmat: GPU-accelerated plane-wave DFT calculations
• PWSCF (Quantum ESPRESSO): Open-source DFT suite with extensive capabilities
• Custom: User-defined interfaces for specialized calculation methods

Key Features

Each software entry includes:

• Brief description and primary use cases
• Key technical features relevant to DP-GEN workflows
• Official website links for further reference
• Specific usage notes within DP-GEN context
• Configuration requirements and recommendations

Additional Sections

• Software selection guidelines for choosing appropriate tools based on system type and requirements
• Configuration notes covering installation, machine files, input preparation, and performance considerations
• Cross-references to existing parameter documentation and examples

Validation

• Documentation builds successfully without errors using Sphinx
• All external links are functional and point to official software websites
• Page is properly integrated into the documentation navigation structure
• Content follows existing documentation style and formatting conventions

This comprehensive reference will help users make informed decisions about software selection and configuration for their DP-GEN workflows.

Fixes #1003.

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