fix(css): add star.gif

[OnkarRuikar]

• required for content PR fix(css): new pages for <url> and url() content#35486

I've used existing images from the shared-assets in the PR. The star.gif would be an excellent addition to reusable images for the demos.

[pepelsbey]

How about we use this opportunity to replace the ancient GIF format with a bit more suitable PNG? It also a bit smaller :) 253 bytes vs 396 bytes 🧐

[OnkarRuikar]

How about we use this opportunity to replace the ancient GIF format with a bit more suitable PNG? It also a bit smaller :) 253 bytes vs 396 bytes 🧐

What size would you prefer? We can have multiple sizes for multiple scenarios.

[pepelsbey]

What size would you prefer? We can have multiple sizes for multiple scenarios.

8px based sizes are usually pretty common: 16, 24, 32. Something like that :)

[OnkarRuikar]

8px based sizes are usually pretty common: 16, 24, 32. Something like that :)

Created 16x16, 32x32, and 256x256 sized normal and inverted versions.

Also added some more images from the content repo that have been duplicated 3-4 times. We will update content later.

[bsmth]

Carrying this one over since Vadim is on PTO. Looks like review comments addressed, everything else looks good to me. Thank you!