fix(ui): standardize navbar across landing pages

[Nightkilller]

Description

This PR standardizes navbar behavior and layout consistency across the landing page, feature pages, and team page.

The changes focus on:

• unifying navigation links,
• standardizing CTA and branding behavior,
• centralizing navbar interaction logic,
• and preserving responsive/mobile functionality.

Fixes #55

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Pillar

• UI / UX Improvement
• Code Quality / Refactor
• Feature
• Documentation

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Changes Made

• Added centralized public/js/navbar.js for shared navbar interactions
• Removed duplicated navbar logic from:
  • public/js/home.js
  • public/js/features.js
• Standardized navbar links and Team navigation across:
  • homepage
  • feature pages
  • team page
• Unified responsive/mobile navbar behavior
• Standardized CTA/link behavior and theme-toggle initialization
• Updated team.html to use the shared navbar structure

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Verification

• Verified navbar consistency across landing and feature pages
• Verified responsive/mobile behavior manually
• Tested dropdown interactions and navigation links
• Confirmed Team page uses standardized navbar layout

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Checklist

• Changes are focused and minimal
• Existing functionality was preserved
• Responsive behavior was verified
• No unrelated UI modifications were introduced

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