[nautilus-python] Created tag 4.0

[Jan Tojnar <jtojnar src gnome org>]

The signed tag '4.0' was created.

Tagger: Jan Tojnar <jtojnar gmail com>
Date: 1663446548 +0200

    Release 4.0
    
    - Updated migration docs and rewrote overview.

Changes since the last tag '4.0.alpha':

Jan Tojnar (10):
      build: Detect docs changes
      docs/migrating-to-4: add heading to “more info” section
      docs/overview: Clean up
      docs/migrating-to-4: add suggestions for supporting both API versions
      docs: Clean up old entities
      Add files for Nix development environment
      ci: Add simple build action using Nix
      README: add API docs link
      docs/migrating: Mention GTK 4 ABI concerns
      Release 4.0