Add security headers and CSP configuration

[amiable-dev]

Description

The site currently lacks security headers and Content Security Policy (CSP) configuration which are important for protecting against various web vulnerabilities.

Impact

Without proper security headers, the site may be vulnerable to:

• Cross-site scripting (XSS) attacks
• Clickjacking
• MIME type sniffing exploits
• Other common web security issues

Proposed Solution

1. Add security headers through static hosting configuration or custom middleware:

Strict-Transport-Security: max-age=31536000; includeSubDomains
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
Referrer-Policy: strict-origin-when-cross-origin
Content-Security-Policy: [appropriate policy based on site needs]

2. Implement CSP policy appropriate for Docusaurus:

• Script sources for required functionality
• Style sources for theme components
• Image sources for content
• Font sources for typography

Acceptance Criteria

• Security headers are properly configured
• CSP is implemented without breaking site functionality
• Headers are verified using security scanning tools
• No console errors related to CSP violations
• Documentation updated with security configuration details

Implementation Notes

• Consider using docusaurus.config.js customizations or hosting platform configurations
• Test in development environment before deploying to production
• Ensure all third-party resources are properly allowed in CSP