[docs] Add updated theme builder to community resources

[PeterTYLiu]

Related page

https://mui.com/material-ui/customization/theming/#theme-builder

Kind of issue

Other

Issue description

The theme builder linked in the docs is unmaintained and stuck on MUI 5. I'd like to submit my own MUI 7-based theme builder to be included in the docs as a resouce.

Link: https://petertyliu.github.io/mui-theme-builder/
Repo: https://github.com/PeterTYLiu/mui-theme-builder

(apologies in advance if this breaks any rules around self-promotion)

Context

No response

Search keywords: theme, theming, theme builder

[linear]

MAT-1766

[oliviertassinari]

This sounds like about fixing a regression, label updated.

[siriwatknp]

Feel free to submit a PR.