feat: revamp timeline, advanced media modal, and CMS relations

[FazelX]

This pull request introduces several major enhancements to the portfolio website:

1. Interactive Experience Timeline: Floating portfolio cards now render alongside their corresponding Experience timeline nodes if they are related in the CMS. Uses Framer Motion for elegant floating animations and SVGs for visual connecting lines. Handles layout logic for staggered display and includes a "See all" button for nodes with >5 related projects.
2. Advanced Portfolio Modal: Implemented an Embla-carousel-powered lightbox/modal that triggers when clicking any portfolio card. It natively supports swiping through multiple images and .mp4/.webm videos, displays tech stacks, renders CMS Markdown descriptions properly via react-markdown, and provides link buttons.
3. Decap CMS Expansions: Updated public/admin/config.yml to support Relational Data (Projects -> Experiences) via a relation widget. Transitioned the single Project "image" field to a "media" list widget. Created a new Global Settings collection to manage Hero text, Name, and an enable_bilingual toggle that dynamically hides the UI language switcher and redirects Persian users if disabled.
4. Data Refactoring: Safely migrated hardcoded TS data and static markdown files to utilize gray-matter, ensuring the CMS relation schema builds successfully.
5. Documentation: Added clear, step-by-step CMS usage instructions to README.md.

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PR created automatically by Jules for task 3661369925815460741 started by @FazelX

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