add writings collection and first paper

[DrewMcArthur]

todo:

• update header navigation.
  • it'd be cool if on writings pages it reflected the markdown headers,
  • but otherwise a bit of breadcrumbs + sibling pages would be nice.
• check this paper to make sure it matches the pdf
• add pdf download links
• style references and other bits
• add bsky comments?
• add other papers
  • cpe reaction papers
  • phil of injustice papers
• mobile post styling
  • ensure links wrap
  • title is still behind header

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