Add links to the README

README.md

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 Noteburst is a Rubin Science Platform service that coordinates running Jupyter Notebooks in a JupyterLab context.
 Noteburst can be used by CI and monitoring services, as well as for applications that need to compute and render Jupyter Notebooks programatically.
+[Times Square](https://times-square.lsst.io) uses Noteburst to render Jupyter Notebooks in the browser, for example.
+
+## Links
+
+- [User guide](https://noteburst.lsst.io)
+- [SQR-065](https://sqr-065.lsst.io/) (design document)
+- [Noteburst in Phalanx](https://phalanx.lsst.io/applications/noteburst/index.html)