**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).
css={{
          display: 'flex',
          flexDirection: 'column',
          minHeight: 'calc(100vh - 40px)',
        }}>
        <Header location={location} />
        <Flex
          direction="column"
          shrink="0"
          grow="1"
          valign="stretch"
          css={{
            flex: '1 0 auto',
            marginTop: 60,
            [media.between('medium', 'large')]: {
              marginTop: 50,
            },
            [media.lessThan('medium')]: {
              marginTop: 40,
            },
          }}>
          {children()}
        </Flex>
        <Footer layoutHasSidebar={layoutHasSidebar} />
      </div>
    );
  }
}
export default Template;