Feature Request: Add Custom Font Support

### Is your feature request related to a problem? Please describe.

Hey, I think it’d be great if users could customise the font for the README stats. It’d make them more personal and let people match the style with their branding or project look. What do you think?

### Describe the solution you'd like

I’d like to have a way to specify custom fonts for the README stats. Maybe add a font parameter to the API where users can choose from a list of supported fonts or even provide a custom font URL (like Google Fonts). If a custom font isn’t available, there should be a fallback to a default one. This way, users can easily style the stats to match their preferences.

### Describe alternatives you've considered

_No response_

### Additional context

_No response_