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[bot]]

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

[maximevtush]

@wackerow @corwintines @pettinarip @minimalsm

[github-actions[bot]]

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

[maximevtush]

@wackerow @corwintines @pettinarip @minimalsm

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[wackerow]

@all-contributors please add @maximevtush for maintenance

[allcontributors[bot]]

@wackerow

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