Write demos and documentation

[danielballan]

Accumulate a collection of demos and examples covering basic scientific stack, as well as tools developed at BNL and other labs.

[danielballan]

Specifically, databroker and general data-loading tutorials to go with the scikit-xray tutorials.

[danielballan]

Need dev-oriented Python package docs for:

• [x] bluesky
• [x] ophyd
• [x] databroker
• [ ] datamuxer (exists, but is way behind)
• [ ] filestore
• [ ] metadatastore
• [x] suitcase
• [ ] album
• [ ] scikit-xray (update introduction and collaboration with SLAC)