feat: build localized xml feeds

[ramboz]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #

Test URLs:

• Before: https://main--petplace--hlxsites.hlx.page/
• After:
  • https://--petplace--hlxsites.hlx.live/
  • https://--petplace--hlxsites.hlx.live/?martech=off

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Commits

• 4a7d463 ✅ (latest)
• 5e902ca ✅
• 558dfae ✅
• 707d959 ✅
• 6a321b7 ✅