Update docs sidebar (#1272)

Author: deliahu

docs/miscellaneous/contact-us.md

@@ -0,0 +1,19 @@
+# Contact us
+
+_WARNING: you are on the master branch, please refer to the docs on the branch that matches your `cortex version`_
+
+## Support
+
+[GitHub](https://github.com/cortexlabs/cortex/issues) - Submit feature requests, file bugs, and track issues.
+
+[Gitter](https://gitter.im/cortexlabs/cortex) - Chat with us in our community channel.
+
+[Email](mailto:hello@cortexlabs.dev) - Email us at `hello@cortexlabs.dev` to contact us privately.
+
+## Contributing
+
+Find instructions for how to set up your development environment in the [development guide](../contributing/development.md).
+
+## We're hiring
+
+Interested in joining us? See our [job postings](https://angel.co/company/cortex-labs-inc/jobs).

docs/summary.md

@@ -5,9 +5,7 @@
 * [Tutorial](../examples/pytorch/text-generator/README.md)
 * [GitHub](https://github.com/cortexlabs/cortex)
 * [Examples](https://github.com/cortexlabs/cortex/tree/master/examples)  <!-- CORTEX_VERSION_MINOR -->
-* [Chat with us](https://gitter.im/cortexlabs/cortex)
-* [Email us](mailto:hello@cortex.dev)
-* [We're hiring](https://angel.co/cortex-labs-inc/jobs)
+* [Contact us](miscellaneous/contact-us.md)
 
 ## Deployments