website/integrations: Update Komga instructions to add "email_verified" attribute to "email" claim.

[tumpech]

Details

komga requires the email_verified attribute to be True, which is not the default since 2025.10.

Added instructions on how to do it in non-prod and prod environments.

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make docs)

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[dewi-tik]

Thanks for the contribution @tumpech. Because this is likely to come up again, I've created a PR (#20141) that adds this information to our main docs. This can then be linked to from the Komga integration doc and any other application integration docs that require it. This avoids duplicating the information across docs.

Once that PR is merged, we can introduce it as a link in this PR. I hope that's alright with you.

[tumpech]

Perfectly reasonable. I'll keep an eye on that PR and update this one once that is done.
However, other parts of the document are step-by-step instructions and that PR's instruction does not include where to setup the mapping. It'll still be shorter for the integrations, so I'm happy with this change.