Proposal: Redesigned landing page for Actix Website

Hello,

I took some time to redesign the Actix Web landing page with a more modern visual approach.

The goal wasn't to change the content or structure deeply, but simply to propose a refreshed version that might better align with current UI trends and make the project look a bit more up to date.

Here’s the redesign preview:


And here’s the Figma file (view-only):
https://www.figma.com/design/rLouHuJi9gONS0bJPlb7QU/ACTIX-WEB?node-id=0-1&t=vhRI5DQGXUjwcyTL-1

If you're interested, I'm happy to open a PR to implement the design.
And if you'd prefer to adapt it yourself, I can also help make adjustments or iterate based on your feedback.

Let me know what you think!