Dashboard Developer Guide now live -- formerly HACKING.rst

The document formerly known as "HACKING.rst" is now live on the docs website at the following location: https://docs.ceph.com/docs/master/dev/developer_guide/dash-devel/ This represents a significant addition to the Developer Guide. If you haven't seen it before, take a look. It's big. Please direct pull requests against this new file and not against HACKING.rst. Zac Dover Upstream Docs Ceph