vimPlugins.obsidian-nvim: switch to community fork

[GaetanLepage]

Things done

https://github.com/epwalsh/obsidian.nvim is unmaintained and obsidian.nvim has been forked by the community.
Let's use the maintained repo: https://github.com/obsidian-nvim/obsidian.nvim/

• 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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[GaetanLepage]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 391643 --package vimPlugins.obsidian-nvim

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x86_64-linux

✅ 1 package built:

• vimPlugins.obsidian-nvim

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aarch64-linux

✅ 1 package built:

• vimPlugins.obsidian-nvim

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x86_64-darwin

✅ 1 package built:

• vimPlugins.obsidian-nvim

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aarch64-darwin

✅ 1 package built:

• vimPlugins.obsidian-nvim

[MattSturgeon]

Some discussion upstream about forking: epwalsh/obsidian.nvim#820