Remove "Feature Freeze" notice in the book

[profetia]

Description

The temporary notice for feature freeze from June 26th to September 18th is still in the book, though the feature freeze is already finished.

Version

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No response

[blyxyas]

Have we not rebuilt the book for the last 2 months? What's going on here? #15690 Removed that banner and any other references to the feature freeze.

[ada4a]

Have we not rebuilt the book for the last 2 months?

I think so, yes