feat: create new canvas bg animation for dark theme

[SGiaccobasso]

Description

⛑️ What was done:

Change the video used in the background animation to a new animation using canvas.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [x] Ready to merge

🧪 How to test:

Check that on dark mode we have a new animation with smaller elements and which moves on scroll.

🗒️ Notes:

This change could result in a change in loading times, we should check if the change is positive or negative.

• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

🖼️ Screenshots:

Desktop:

https://github.com/axelarnetwork/axelarjs/assets/44235486/111583d2-822d-49c9-9bc7-950038b0fa69

Mobile:

closes #(ticket)

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Latest commit: 14686b33df3db2299dd53f1fb8f1fc10e67c6c97

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