[UI request] Add user tutorial pop-ups to mothra landing page, IC, and Neon

Here's an example in Pixel.js in Rodan, where opening the window makes a tutorial pop up appear, which the user can choose to skip:

https://github.com/user-attachments/assets/7642d10b-4d1d-4a10-9a88-8a895e017cce

I think the tutorial pop-up can just be images and text. It can also be fairly basic, and include links to the more detailed documentation.

@kyrieb-ekat proposes that these tutorials appear when the user opens the mothra landing page, the IC, and Neon for the first time. @giannatan I would be super happy to make the Neon tutorial, and the other two if it can be useful!

This issue is not urgent.