[website update] Add animated logo to the website and github

[ffuuugor]

[ashkan-software]

We have animated logo for Opacus. We have it on GIF and MOV and JSON format. We prefer to show it with JSON format, as it is a smaller file. Some resources: https://wp-rocket.me/blog/replacing-animated-gifs-with-html5-video-for-faster-page-speed/ https://codepen.io/mmdileepthomas/pen/QroQZp https://css-tricks.com/animating-with-lottie/ https://thesvbd.github.io/Lottie-examples/

[ashkan-software]

This is already done :)