home: set CARGO_TARGET_DIR to ~/.target/

Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/9ba7b3990eb1f4782ea3f5fe7ac4f3c88dd7a32c' (2023-06-16)
  → 'github:nix-community/home-manager/c24deeca64538dcbc589ed8da9146e4ca9eb85b7' (2023-07-03)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/7c67f006ea0e7d0265f16d7df07cc076fdffd91f' (2023-06-15)
  → 'github:nixos/nixpkgs/645ff62e09d294a30de823cb568e9c6d68e92606' (2023-07-01)

flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1686922395,
-        "narHash": "sha256-ysevinohPxdKp0RXyhDRsz1/vh1eXazg4AWp0n5X/U4=",
+        "lastModified": 1688409282,
+        "narHash": "sha256-nnVCN5QiZ5+DEc70PRQLEcxqlxtsmeBU1BnpsRPUJlA=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "9ba7b3990eb1f4782ea3f5fe7ac4f3c88dd7a32c",
+        "rev": "c24deeca64538dcbc589ed8da9146e4ca9eb85b7",
         "type": "github"
       },
       "original": {
@@ -22,11 +22,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1686869522,
-        "narHash": "sha256-tbJ9B8WLCTnVP/LwESRlg0dII6Zyg2LmUU/mB9Lu98E=",
+        "lastModified": 1688231357,
+        "narHash": "sha256-ZOn16X5jZ6X5ror58gOJAxPfFLAQhZJ6nOUeS4tfFwo=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "7c67f006ea0e7d0265f16d7df07cc076fdffd91f",
+        "rev": "645ff62e09d294a30de823cb568e9c6d68e92606",
         "type": "github"
       },
       "original": {

hosts/apps.nix

@@ -34,7 +34,6 @@
     # Applications
     anki-bin
     discord
-    elementary-planner
     gimp
     krita
     inkscape

hosts/home.nix

@@ -80,6 +80,9 @@ in
   home = {
     username = "${user}";
     homeDirectory = "/home/${user}";
+    sessionVariables = {
+      CARGO_TARGET_DIR = "$HOME/.target/";
+    };
 
     stateVersion = "22.05";
   };