- some potentially useful (review as needed)
- speeds up compilation

- yaml (configuration & metadata)
  site config,
  pod:
    pod.manifest,
    doc header:
      make,
      meta
- pod.manifest in yaml breaks
  - older program reading new pod and
  - newer program reading old pod
- read config first,
  - get site default language in case it is absent
    in pod.manifest
  -  ensure config is not read too many times
     (it is at present, revisit)