feat: Update color converter page (HEX / RGB Converter)

[LeonKohli]

Hey team, I've made some significant improvements to the Color Converter tool (HEX / RGB Converter). Instead of just handling HEX to RGB conversions, it now supports conversions between HEX, RGB, HSL, and CMYK formats.

Here's what's new:

• Renamed to Color Converter
• Conversions between all four color formats
• Easier for users to select a color from the OS color picker.

I think this update will make the tool much more useful for our team and potentially save us some time when working with various color systems. I'd appreciate it if you could take a look and let me know your thoughts. If it seems valuable to you too, I'd love to get this merged into the main branch. Looking forward to your feedback! 🔥

[erik-thorsell]

adding HSV to this would potentially increase interest from the luau community

[peckz]

Thanks for creating this PR! I'm on vacation until 9th September, after that I'm going to have a look!