Refactor/navbar cleanup star

[maruf-pfc]

Proposed Changes

• Deployment Cleanup: Removed GitHub Pages workflow and badges to simplify the ecosystem.
• Vercel Optimization: Updated vite.config.js to use base: '/' and added vercel.json for robust SPA routing.
• Navbar Refactoring: Centered the header content using a new .container utility to match the page layout.
• UX Improvement: Fixed the confusing "60 rem" rate-limit text by replacing it with a "Requests Remaining" bolt icon.
• Community Growth: Added a high-visibility "Star on GitHub" button in the header and added a "TIP" section to the README.

Description

This PR refactors the core deployment and UI infrastructure to ensure a professional and bug-free production experience. By switching to a root-relative base path, we resolve the "blank screen" issues observed on Vercel.

The UI refinements focus on centering the navigation bar for better visual balance and improving the clarity of technical information (API limits). The addition of the Star button and TIP banner helps improve project discoverability.

Related Issues

Resolves the Vercel 404 deployment error and several layout inconsistencies.

Checklist

• I have followed the Contributing Guidelines.
• I have performed a self-review of my own code.
• My changes generate no new linting errors.
• I have added tests that prove my fix is effective or that my feature works.
• I have updated the documentation accordingly.