Add NPM package link and improve badge styling in README

[Copilot]

This PR addresses the request to add a link to the NPM package and clean up the styling of the "official website" section in the README.

Changes Made

Before:

🌐 **[Official Website](https://cached-middleware-fetch-next.dev/)** | [![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/bookernath/cached-middleware-fetch-next)

After:

[![NPM Version](https://img.shields.io/npm/v/cached-middleware-fetch-next.svg)](https://www.npmjs.com/package/cached-middleware-fetch-next)
[![Official Website](https://img.shields.io/badge/website-cached--middleware--fetch--next.dev-blue.svg)](https://cached-middleware-fetch-next.dev/)
[![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/bookernath/cached-middleware-fetch-next)

Improvements

1. Added NPM Package Link: Now includes a direct link to the NPM package (https://www.npmjs.com/package/cached-middleware-fetch-next) with a dynamic version badge
2. Improved Visual Consistency: Replaced the mixed emoji + bold text format with consistent badge styling for a more professional appearance
3. Better Organization: All badges are now uniformly formatted and aligned vertically for improved visual flow and readability

The changes maintain all existing functionality while providing easier access to the NPM package and a cleaner, more standardized presentation that's common in open source projects.

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