- org preprocessing:
    - dump properties
    - fontify TODO keywords
- compute "leak count" on toplevel index
- get stylin'
    - pandoc template
    - tufte css? at least sidenotes rather than footnotes
- use tags somehow, eg
    - fill in the "keywords" metadata in pandoc template
    - index files/sections by tags
- add author
- add creation & last update dates
- link to history