Steam Autodata Integration

## Desiderata

- [x] Have someone read a draft
- [x] Keywords/tags
- [x] Title image
- [ ] Link preview excerpt
- [x] Publish
- [ ] Blog blurbs
- [ ] Waggledance
- [ ] Tweet
- [ ] Tip of the day

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## Cognata

* https://github.com/beeminder/integrations/issues/129

_**Verbata**: new autodata integrations, video games,_