Update link to Fluffy on the Portal Network page

[maximevtush]

This change updates the link to point to our Fluffy book/documentation site.

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[github-actions]

This issue is stale because it has been open 30 days with no activity.

[maximevtush]

@wackerow @corwintines @pettinarip @minimalsm

[github-actions]

This issue is stale because it has been open 30 days with no activity.

[maximevtush]

@wackerow @corwintines @pettinarip @minimalsm

[wackerow]

Thanks @maximevtush

cc: @lukassim can we upload https://github.com/ethereum/ethereum-org-website/blob/dev/public/content/developers/docs/networking-layer/portal-network/index.md (updated in #15165) to Crowdin to prevent this from reverting in two weeks? 🙏

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[wackerow]

@all-contributors please add @maximevtush for maintenance

[allcontributors]

@wackerow

I've put up a pull request to add @maximevtush! 🎉