**Do you want to request a *feature* or report a *bug*?**
Bug

**What is the current behavior?**
The documentation for [warnings](https://github.com/facebook/react/tree/master/docs/warnings) returns a 404

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template: https://jsfiddle.net/ebsrpraL/).**
https://cl.ly/080p0f1t400y

**What is the expected behavior?**
Redirect to correct documentation.

~~**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**~~

---
The workaround is to look at the cached version from a google search or check for markdown [here](https://github.com/facebook/react/tree/master/docs/warnings).
path: slug,
        component: installationTemplate,
        context: {
          slug,
        },
      });
    } else if (slug === 'docs/error-decoder.html') {
      
      
    } else if (
      slug.includes('blog/') ||
      slug.includes('community/') ||
      slug.includes('contributing/') ||
      slug.includes('docs/') ||
      slug.includes('tutorial/')
    ) {
      let template;
      if (slug.includes('blog/')) {
        template = blogTemplate;
      } else if (slug.includes('community/')) {
        template = communityTemplate;
      } else if (slug.includes('contributing/') || slug.includes('docs/')) {
        template = docsTemplate;
      } else if (slug.includes('tutorial/')) {
        template = tutorialTemplate;
      }
      const createArticlePage = path =>
        createPage({
          path: path,
          component: template,