Adds Slack webhook notifications when new OWASP projects are added to the funding list.

Changes Made

• Detection Logic: Compares old and new project_repos_links.json to identify new projects seeking funding
• Slack Notifications: Sends formatted Block Kit messages to Slack webhook when new projects are detected
• Workflow Update: Added SLACK_WEBHOOK_URL environment variable to GitHub Actions workflow
• Documentation: Updated README with setup instructions for Slack notifications
• Repository Cleanup: Added .gitignore to exclude Python build artifacts

How It Works

1. The script loads the existing project_repos_links.json file at startup
2. After scraping all OWASP projects, it compares the new list with the old list
3. Projects with repo URLs not in the old list are identified as "new"
4. If new projects are found and SLACK_WEBHOOK_URL is configured, sends a formatted notification to Slack
5. If the webhook URL is not set, the script continues normally without sending notifications

Setup

To enable Slack notifications, add the SLACK_WEBHOOK_URL repository secret with your Slack webhook URL.

Testing

• ✅ Python syntax validation passes
• ✅ Logic tested locally with simulated old/new project lists
• ✅ Code review completed - no issues found
• ✅ Security scan (CodeQL) completed - 0 vulnerabilities found

The changes are minimal and focused, maintaining backward compatibility while adding optional notification functionality.

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