docs: add zeroentropy as a community provider (#14290)

## Background

Adding ZeroEntropy to the list of community providers on the
documentation.

## Summary

Updated the documentation to reflect ZeroEntropy's availability.

## Checklist

- [ ] Tests have been added / updated (for bug fixes / features)
- [ ] Documentation has been added / updated (for bug fixes / features)
- [ ] A _patch_ changeset for relevant packages has been added (for bug
fixes / features - run `pnpm changeset` in the project root)
- [x] I have reviewed this pull request (self-review)

Author: Ghitahouir

content/docs/02-foundations/02-providers-and-models.mdx

@@ -91,6 +91,7 @@ The open-source community has created the following providers:
 - [Soniox Provider](/providers/community-providers/soniox) (`@soniox/vercel-ai-sdk-provider`)
 - [Zhipu (Z.AI) Provider](/providers/community-providers/zhipu) (`zhipu-ai-provider`)
 - [OLLM Provider](/providers/community-providers/ollm) (`@ofoundation/ollm`)
+- [ZeroEntropy Provider](/providers/community-providers/zeroentropy) (`zeroentropy-ai-provider`)
 
 ## Self-Hosted Models