feat: add custom font support with Inter as default

[Luorivergoddess]

Add support for custom fonts through a configuration system that allows users to easily customize their portfolio's typography.

Changes:

• Create fonts.ts configuration module for centralized font management
• Implement font loader with Inter as the default font
• Add font configuration to the style system
• Integrate with existing configuration structure

This enhancement allows users to:

• Configure custom fonts through a simple configuration interface
• Maintain consistent typography across the portfolio
• Easily switch between different fonts without code changes
• Example implementation uses Inter as the default font to demonstrate the functionality while maintaining the clean design of Magic Portfolio.

Here is the example screenshot (using Maple-Mono as main font):

[vercel]

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[lorant-one]

also merged this with a few tweaks in the latest release - it was a great idea to bring the font settings to the config file. thanks for your contribution once again!

(instead of local imports i changed it to work with next/font so you can erasily import from Google fonts)