feat: update navigation and contents

[Scott1UP]

Rework website navigation IA

Restructures the desktop and mobile navigation to match the new IA from Figma (Dev Handoff), and refreshes the footer to match.

Navigation

• New IA: nav items regrouped into dropdown sections (About, Attend, etc.) with section headers, icons, and optional two-column layouts, driven by useNavigationData.ts
• Morphing dropdown: a single shared foldout card now morphs position, width, and height between nav items instead of each item owning its own menu
• Content cross-fade: switching between dropdowns swaps content with a blur cross-fade — the incoming items are delayed 50ms so the outgoing items mostly clear first, and land in sync with the card morph at 200ms
• Keyboard support: arrow keys move between items (changes snap instantly rather than animating), Escape closes and returns focus, ArrowDown enters the menu; prefers-reduced-motion disables all motion
• Mobile: nav rebuilt as an accordion that auto-opens the group containing the current page

Footer & links

• Footer columns updated to mirror the new IA
• External links now use the Lucide ArrowUpRight indicator (replaces link-indicator.svg)
• New intl strings in content/en/intl/common.json (hi/mr translated by CI)

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[didierkrux]

Fixed the deployment preview link by re-running it manually. It was a bug on GitHub's end.

Ready to merge. Menu transitions feel great!

Comments: on desktop, all menu auto-opens, except the language one

[Scott1UP]

Good feedback, I'll roll that improvement in to adding the Travel Guide page link tomorrow/Wed ✌🏼