spr: update GitHub url and maintainer's GitHub account

I am the creator and maintainer of spr. I started the project while
employed at Cord (who at the time owned the cord.com domain), and Cord
allowed me to spend some time at work maintaining spend. I have
since left Cord, and later Cord ceased operations. The spr repository
was then transferred to my personal GitHub account.

This commit updates the GitHub URL of spr, and also changes the
maintainer from my Cord-related GitHub account (sven-of-cord) to my
personal one (spacedentist).

maintainers/maintainer-list.nix

@@ -22870,6 +22870,12 @@
     githubId = 10437171;
     keys = [ { fingerprint = "75F0 AB7C FE01 D077 AEE6  CAFD 353E 4A18 EE0F AB72"; } ];
   };
+  spacedentist = {
+    email = "sp@cedenti.st";
+    github = "spacedentist";
+    githubId = 1536420;
+    name = "Sven Over";
+  };
   spacefrogg = {
     email = "spacefrogg-nixos@meterriblecrew.net";
     github = "spacefrogg";
@@ -23408,12 +23414,6 @@
     githubId = 306190;
     name = "Svend Sorensen";
   };
-  sven-of-cord = {
-    email = "sven@cord.com";
-    github = "sven-of-cord";
-    githubId = 98333944;
-    name = "Sven Over";
-  };
   Svenum = {
     email = "s.ziegler@holypenguin.net";
     github = "Svenum";

pkgs/development/tools/spr/default.nix

@@ -23,8 +23,8 @@ rustPlatform.buildRustPackage rec {
   meta = with lib; {
     description = "Submit pull requests for individual, amendable, rebaseable commits to GitHub";
     mainProgram = "spr";
-    homepage = "https://github.com/getcord/spr";
+    homepage = "https://github.com/spacedentist/spr";
     license = licenses.mit;
-    maintainers = with maintainers; [ sven-of-cord ];
+    maintainers = with maintainers; [ spacedentist ];
   };
 }