deepdwn: init at 0.41.0

[ymstnt]

Deepdwn is a proprietary Markdown editor and organizer for Windows, Mac and Linux.
Homepage: https://www.deepdwn.com/

It is a paid app, so this package only provides the necessary build instructions and not the program itself, the user needs to supply their own AppImage, which can be purchased here: https://billiam.itch.io/deepdwn

I've also made an updater script which can be run locally and expects the program's AppImage to be downloaded from Itch (pkgs.itch) to the default path given.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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