doc: require Sphinx 2.4.4
Require Sphinx 2.44 to build the documentation.
Remove all code related to earlier versions.
Signed-off-by: 
Heinrich Schuchardt <xypron.glpk@gmx.de>
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Require Sphinx 2.44 to build the documentation.
Remove all code related to earlier versions.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>