Move overlays into their own dirs

overlays/vpngate/default.nix

@@ -0,0 +1,24 @@
+{ lib, fetchFromGitHub, buildGoModule }:
+
+buildGoModule rec {
+
+  pname = "vpngate";
+  version = "v0.0.2";
+
+  vendorSha256 = "1ys2rvrbxgsrvmjdxqgpmxf0m9nlp905gnr2mrf3c7iaxm86wgf8";
+
+  src = fetchFromGitHub {
+    owner = "davegallant";
+    repo = "vpngate";
+    rev = version;
+    sha256 = "0ky3wd04xd4sb2zskrrlbgys2gw88yqhngg3bl0sjy8kr6099vfn";
+  };
+
+  meta = with lib; {
+    homepage = "https://www.vpngate.net";
+    description = "a client for vpngate.net";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ davegallant ];
+    platforms = platforms.linux ++ platforms.darwin;
+  };
+}