replace caddy-cloudflare overlay with nixpkgs pr plugin override

overlays/caddy.nix

@@ -1,64 +0,0 @@
-# Adds the Cloudflare DNS validation module
-
-inputs: _final: prev:
-
-let
-
-  plugins = [ "github.com/caddy-dns/cloudflare" ];
-  goImports = prev.lib.flip prev.lib.concatMapStrings plugins (pkg: "   _ \"${pkg}\"\n");
-  goGets = prev.lib.flip prev.lib.concatMapStrings plugins (pkg: "go get ${pkg}\n      ");
-  main = ''
-    package main
-    import (
-    	caddycmd "github.com/caddyserver/caddy/v2/cmd"
-    	_ "github.com/caddyserver/caddy/v2/modules/standard"
-    ${goImports}
-    )
-    func main() {
-    	caddycmd.Main()
-    }
-  '';
-in
-{
-  caddy-cloudflare = prev.buildGoModule {
-    pname = "caddy-cloudflare";
-    version = prev.caddy.version;
-    runVend = true;
-
-    subPackages = [ "cmd/caddy" ];
-
-    src = prev.caddy.src;
-
-    vendorHash = "sha256-zeuvCk7kZa/W/roC12faCQDav4RB8RT1dR2Suh2yjD8=";
-
-    overrideModAttrs = (
-      _: {
-        preBuild = ''
-          echo '${main}' > cmd/caddy/main.go
-          ${goGets}
-        '';
-        postInstall = "cp go.sum go.mod $out/ && ls $out/";
-      }
-    );
-
-    postPatch = ''
-      echo '${main}' > cmd/caddy/main.go
-      cat cmd/caddy/main.go
-    '';
-
-    postConfigure = ''
-      cp vendor/go.sum ./
-      cp vendor/go.mod ./
-    '';
-
-    meta = with prev.lib; {
-      homepage = "https://caddyserver.com";
-      description = "Fast, cross-platform HTTP/2 web server with automatic HTTPS";
-      license = licenses.asl20;
-      maintainers = with maintainers; [
-        Br1ght0ne
-        techknowlogick
-      ];
-    };
-  };
-}