feat: add sitemap

[florian-lefebvre]

Closes #6

• [x] code
• [x] todos
• [x] conflicts
• [x] getDefaultLocalePlaceholder
• [x] update demo
• [x] docs
  • [x] configuration
  • [x] known issues
  • [x] getDefaultLocalePlaceholder
  • [x] new recipe
• [x] lint
• [x] changeset
• [x] content collections helpers
  • [x] code
  • [x] demo
  • [x] add docs
  • [x] update sitemap docs
  • [x] add changeset
  • [x] lint

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[florian-lefebvre]

To be more precise, I'm not fan of having to call the sitemap inside the loop to get the data so if you have some ideas of how the algorithm part could be improved, that would help quite a lot! Otherwise no worries, the integration is still wip so nwtwwhb!