Added footer

[MaryamL12]

✨ PR Description

Purpose: Replace static footer component with dynamic script-based footer that loads external footer content asynchronously from Azure CDN.

Main changes:

• Removed hardcoded footer HTML with navigation links, social media icons, and React Bootstrap dependencies
• Implemented dynamic footer script injection using React useEffect hook with duplicate script prevention
• Deleted footer.css stylesheet and its import from layout.css to reduce bundle size

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[gitstream-cm]

✨ PR Review

The PR refactors the footer to load dynamically from an external script, which reduces code maintenance burden. However, there's a critical security concern with loading external scripts without integrity verification.

2 issues detected:

🔒 Security - Loading external scripts without integrity checks allows potential code injection if the source is compromised

Details: External script is loaded without Subresource Integrity (SRI) verification. This creates a security vulnerability where compromised or hijacked external resources could inject malicious code into the application.
File: src/components/footer.js

🐞 Bug - Script load failures are undetected and unlogged, making issues difficult to diagnose

Details: No error handling for script load failures. If the external script fails to load due to network issues or unavailable resource, the failure will be silent making debugging difficult.
File: src/components/footer.js

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[gitstream-cm]

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