Merge pull request #12141 from ethereum/Add-a-Safe-design-system

 Safe Design system to the list on the Design docs

Author: minimalsm

public/content/developers/docs/design-and-ux/index.md

@@ -83,6 +83,7 @@ Get involved in professional community-driven organizations or join design group
 - [Ethereum.org Design system](https://www.figma.com/@ethdotorg) (Figma)
 - [Finity, a design system by Polygon](https://www.figma.com/community/file/1073921725197233598/finity-design-system) (Figma)
 - [Kleros Design System](https://www.figma.com/community/file/999852250110186964/kleros-design-system) (Figma)
+- [Safe Design System](https://www.figma.com/community/file/1337417127407098506/safe-design-system) (Figma)
 - [ENS Design system](https://thorin.ens.domains/)
 - [Mirror Design System](https://degen-xyz.vercel.app/)