Update Ente GitHub links

[redoomed1]

Changes proposed in this PR:

• Ente
  • Update the GitHub links for all Ente recommendations to reflect the code consolidation detailed in their blog
  • Modify GitHub releases link for Ente Photos to filter the releases to just the entries for Photos (the same was done for the Ente Auth GitHub releases link in #2458)
  • Add link to Ente Auth's documentation
• For consistency, modify Stingle GitHub link in the "Downloads" toggle to point to their Android releases page
• Lowercase the word "passkey" on several pages

Closes #2593

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This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/2024-06-01/18648/1