docs: enhance overview documentation with metadata and structure

[karan7307]

Added description and keywords to the Accord Project overview.

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Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to master from fork:branchname
• Manual accessibility test performed
  • Keyboard-only access, including forms
  • Contrast at least WCAG Level A
  • Appropriate labels, alt text, and instructions

[karan7307]

Overview

This PR improves the Accord Project Overview documentation by adding metadata and refining content structure.

Changes

• Added description and keywords metadata for better SEO and discoverability
• Improved formatting and readability of the overview page
• Cleaned and structured content for a more professional presentation

Flags

• No functional changes; documentation-only update

Screenshots or Video

• Not applicable

Related Issues

• N/A

Author Checklist

• Ensure you provide a DCO sign-off
• Extend the documentation, if necessary
• Commits messages follow AP format
• Merging to master from fork:branchname