flake: Delete Apps — heartwood

Nix Flake Apps are used by nix run, but none of the defined apps are useful to run “one off” anyways.

           };
         };
       apps.default = flake-utils.lib.mkApp {
         drv = self.packages.${system}.radicle;
       };
       apps.radicle-full = flake-utils.lib.mkApp {
         name = "rad";
         drv = self.packages.${system}.radicle-full;
       };
       apps.rad = flake-utils.lib.mkApp {
         name = "rad";
         drv = self.packages.${system}.radicle-cli;
       };
       apps.git-remote-rad = flake-utils.lib.mkApp {
         name = "git-remote-rad";
         drv = self.packages.${system}.radicle-remote-helper;
       };
       apps.radicle-node = flake-utils.lib.mkApp {
         name = "radicle-node";
         drv = self.packages.${system}.radicle-node;
       };
       devShells.default = rustup.craneLib.devShell {
         inherit (self.checks.${system}.pre-commit-check) shellHook;
         buildInputs = self.checks.${system}.pre-commit-check.enabledPackages;