Make root PHILOSOPHY.md a symlink to the docs philosophy page (#13954)

* Make root PHILOSOPHY.md a symlink to the docs philosophy page

The root PHILOSOPHY.md had drifted into a stale duplicate of
docs/source/en/conceptual/philosophy.md (which was rewritten in #13808 to
cover the single-file model policy and Modular Diffusers). Replace it with a
symlink to the docs file, mirroring CONTRIBUTING.md -> contribution.md, so
there's a single source of truth.

A symlink renders as a path stub (not content) on GitHub, so repoint the
links that pointed at blob/main/PHILOSOPHY.md to the rendered docs site:
the PR template and the English contribution guide.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* Point contributor-guide links at the rendered docs site

CONTRIBUTING.md is a symlink, so blob/main/CONTRIBUTING.md renders as a path
stub on GitHub rather than the guide. Repoint the PR template and README
links to the rendered docs page, matching the philosophy/AI-agents links.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* Repoint remaining symlink-stub doc links to the rendered docs site

The stale-bot comment and the ko/zh contribution guides still linked to
blob/main/{CONTRIBUTING,PHILOSOPHY}.md, which render as path stubs because
those root files are symlinks. Point them at the rendered docs pages
(localized /ko/ and /zh/ for the translations).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: yiyixuxu

.github/PULL_REQUEST_TEMPLATE.md

@@ -19,8 +19,8 @@ Fixes # (issue)
 - [ ] Did you use an AI agent (Claude Code, Codex, Cursor, etc.) to help with this PR? If so:
   - [ ] Did you point it at the project conventions in [`.ai/`](https://github.com/huggingface/diffusers/tree/main/.ai) (e.g. via `make claude` / `make codex`)? See [Coding with AI agents](https://huggingface.co/docs/diffusers/main/en/conceptual/contribution#coding-with-ai-agents).
   - [ ] Did you self-review the diff against [`.ai/review-rules.md`](https://github.com/huggingface/diffusers/blob/main/.ai/review-rules.md)?
-- [ ] Did you read the [contributor guideline](https://github.com/huggingface/diffusers/blob/main/CONTRIBUTING.md)?
-- [ ] Did you read our [philosophy doc](https://github.com/huggingface/diffusers/blob/main/PHILOSOPHY.md)? (important for complex PRs)
+- [ ] Did you read the [contributor guideline](https://huggingface.co/docs/diffusers/main/en/conceptual/contribution)?
+- [ ] Did you read our [philosophy doc](https://huggingface.co/docs/diffusers/main/en/conceptual/philosophy)? (important for complex PRs)
 - [ ] Was this discussed/approved via a GitHub issue or the [forum](https://discuss.huggingface.co/c/discussion-related-to-httpsgithubcomhuggingfacediffusers/63)? Please add a link to it if that's the case.
 - [ ] Did you make sure to update the documentation with your changes? Here are the
       [documentation guidelines](https://github.com/huggingface/diffusers/tree/main/docs), and

PHILOSOPHY.md

@@ -0,0 +1 @@
+docs/source/en/conceptual/philosophy.md

PHILOSOPHY.md

@@ -111,7 +111,7 @@ Check out the [Quickstart](https://huggingface.co/docs/diffusers/quicktour) to l
 ## Contribution
 
 We ❤️  contributions from the open-source community!
-If you want to contribute to this library, please check out our [Contribution guide](https://github.com/huggingface/diffusers/blob/main/CONTRIBUTING.md).
+If you want to contribute to this library, please check out our [Contribution guide](https://huggingface.co/docs/diffusers/main/en/conceptual/contribution).
 If you are using an AI agent, please point it at the project conventions in [`.ai/`](https://github.com/huggingface/diffusers/tree/main/.ai) first (run `make claude` or `make codex`) — see [Coding with AI agents](https://huggingface.co/docs/diffusers/main/en/conceptual/contribution#coding-with-ai-agents).
 You can look out for [issues](https://github.com/huggingface/diffusers/issues) you'd like to tackle to contribute to the library.
 - See [Good first issues](https://github.com/huggingface/diffusers/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22) for general opportunities to contribute

README.md

@@ -34,7 +34,7 @@ In the following, we give an overview of different ways to contribute, ranked by
 * 6. Contribute a [Community Pipeline](https://github.com/huggingface/diffusers/issues?q=is%3Aopen+is%3Aissue+label%3Acommunity-examples).
 * 7. Contribute to the [examples](https://github.com/huggingface/diffusers/tree/main/examples).
 * 8. Fix a more difficult issue, marked by the "Good second issue" label, see [here](https://github.com/huggingface/diffusers/issues?q=is%3Aopen+is%3Aissue+label%3A%22Good+second+issue%22).
-* 9. Add a new pipeline, model, or scheduler, see ["New Pipeline/Model"](https://github.com/huggingface/diffusers/issues?q=is%3Aopen+is%3Aissue+label%3A%22New+pipeline%2Fmodel%22) and ["New scheduler"](https://github.com/huggingface/diffusers/issues?q=is%3Aopen+is%3Aissue+label%3A%22New+scheduler%22) issues. For this contribution, please have a look at [Design Philosophy](https://github.com/huggingface/diffusers/blob/main/PHILOSOPHY.md).
+* 9. Add a new pipeline, model, or scheduler, see ["New Pipeline/Model"](https://github.com/huggingface/diffusers/issues?q=is%3Aopen+is%3Aissue+label%3A%22New+pipeline%2Fmodel%22) and ["New scheduler"](https://github.com/huggingface/diffusers/issues?q=is%3Aopen+is%3Aissue+label%3A%22New+scheduler%22) issues. For this contribution, please have a look at [Design Philosophy](https://huggingface.co/docs/diffusers/main/en/conceptual/philosophy).
 
 As said before, **all contributions are valuable to the community**.
 In the following, we will explain each contribution a bit more in detail.