ldm: add homepage

pkgs/by-name/ld/ldm/package.nix

···
 
   meta = {
     description = "Lightweight device mounter, with libudev as only dependency";
+    homepage = "https://github.com/LemonBoy/ldm";
     mainProgram = "ldm";
     license = lib.licenses.mit;
     platforms = lib.platforms.linux;