- compute "leak count" on toplevel index
- lua filter to s/.md/.html on links
- autogenerate nav
- autogenerate breadcrumbs
- get stylin'
    - pandoc template
    - tufte css? at least sidenotes rather than footnotes
- use tags somehow (eg to fill in the "keywords" metadata in pandoc template)
- add author
- add creation & last update dates
- link to history