Merge branch 'eijkhout/fix-script-python' into 'main'

Script: Update python in petscnagupgrade.py

See merge request petsc/petsc!7299

Remove duplicates and switch to python3

Merge branch 'dalcinl/petsc4py-docs' into 'main'

petsc4py documentation sprint (Faversham, England, 2023)

See merge request petsc/petsc!6313

petsc4py documentation sprint (Faversham, England, 2023)

Co-authored-by: Jack Betteridge <j.betteridge@imperial.ac.uk>
Co-authored-by: Nathan Collier <nathaniel.collier@gmail.com>
Co-authored-by: Li

petsc4py documentation sprint (Faversham, England, 2023)

Co-authored-by: Jack Betteridge <j.betteridge@imperial.ac.uk>
Co-authored-by: Nathan Collier <nathaniel.collier@gmail.com>
Co-authored-by: Lisandro Dalcin <dalcinl@gmail.com>
Co-authored-by: Iglesia Dolci <daia.dolci@gmail.com>
Co-authored-by: David Ham <david.ham@imperial.ac.uk>
Co-authored-by: Marcin Rogowski <marcin.rogowski@gmail.com>
Co-authored-by: Koki Sagiyama <k.sagiyama@imperial.ac.uk>
Co-authored-by: Connor Ward <c.ward20@imperial.ac.uk>
Co-authored-by: Stefano Zampini <stefano.zampini@gmail.com>

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