Enhance website performance, security, and accessibility features

[fabienmillet]

This pull request introduces several improvements to SEO, structured data, and the About page. The most significant changes are the migration to react-helmet-async for managing document head and meta tags, the addition of dynamic breadcrumb and page-specific structured data, and enhancements to the About page with a FAQ section and better layout. It also includes minor accessibility and responsive design updates.

SEO and structured data improvements:

• Migrated meta tag and title management to react-helmet-async, enabling server-side rendering compatibility and easier dynamic updates. (package.json, src/main.jsx, src/components/SEO.jsx) [1] [2] [3]
• Added dynamic BreadcrumbList structured data to all pages for improved search engine indexing and navigation. (src/components/SEO.jsx)
• Expanded page-specific Schema.org structured data:
  • About page now includes both AboutPage and FAQPage schemas with localized questions/answers. (src/pages/AboutPage.jsx)
  • Projects page includes a CollectionPage schema and a SoftwareApplication schema for each project. (src/pages/ProjectsPage.jsx)
  • Team page adds image and sameAs fields to each team member's structured data. (src/pages/TeamPage.jsx)
• Removed the hardcoded organization-level Schema.org JSON-LD from index.html in favor of per-page dynamic schemas. (index.html)

About page enhancements:

• Added a FAQ section with two common questions and answers, styled and structured for both users and search engines. (src/pages/AboutPage.jsx, src/pages/AboutPage.css) [1] [2]
• Improved About page layout and card responsiveness for better visual hierarchy and mobile support. (src/pages/AboutPage.css)

Accessibility and responsive design:

• Hid the interactive spotlight background on mobile devices for better usability. (src/components/InteractiveBackground.css)

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