Add roadmap

[mjovanc]

I want it to look like: https://kryptokrona.org/roadmap

And I think it's good to have it underneath "Features".

Also, I want to have a toggle that switches from Delta to Nebula road map. If you disagree, you can come up with a suggestion of something else. I'm open minded. I just need to present the road map on the website.

You can start by adding MVP of Delta to Q2

Here when you hover over the "..." I want to present the description for it. You can just add some dummy data for now and I will add it later.

It would be nice with a headline before the roadmap starts like "Roadmap".