Install chawan in Linux for the TUI web browser

Resolves GH-736
Might be related in GH-740

home-manager/packages.nix

@@ -134,6 +134,11 @@ with pkgs;
   # `tldr` rust client, tealdeer is another candidate.
   # Do not inject this tlrc package in macOS, it is broken even in stable NixOS channel. See GH-720
   tlrc
+
+  # Alt w3m
+  # Do not install in dawin yet: https://github.com/NixOS/nixpkgs/blob/b4b293ec6c61e846d69224ea0637411283e2ad39/pkgs/by-name/ch/chawan/package.nix#L82
+  # Keybindigs: https://git.sr.ht/~bptato/chawan/tree/master/item/res/config.toml
+  edge-pkgs.chawan # `cha`
 ])
 ++ (lib.optionals stdenv.isDarwin [
   # https://github.com/NixOS/nixpkgs/issues/240819

nixos/configuration.nix

@@ -195,6 +195,8 @@
       podman-tui
       docker-compose
 
+      edge-pkgs.chawan
+
       ## Unfree packages
 
       (edge-pkgs.vscode.override (prev: {