This is because the pre-built HTML were removed, and building docs using sphinx was off.
Depends on #24972
CC: @dimpase @vbraun @haraldschilly @sagetrac-mvngu
Component: packages: standard
Keywords: spkg
Author: Leif Leonhardy, Dima Pasechnik, Jeroen Demeyer
Branch/Commit: public/14645 @ 61f5908
Reviewer: Dima Pasechnik
Issue created by migration from https://trac.sagemath.org/ticket/14645