refactor: consolidate Nix.org and Emacs.org

The configuration options that used to be stored in Emacs.org and
Nix.org are now no longer split into two files. Instead, there now
is a single file SwarselSystems.org that holds both these configs.

flake.lock

@@ -917,27 +917,6 @@
         "type": "github"
       }
     },
-    "pia": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1687263775,
-        "narHash": "sha256-sSVNT3o+4RcdnUqdVloPc3UvM3LancTY6htyzAHrC0w=",
-        "ref": "development",
-        "rev": "190f8040cc4837fb6b3c43032711e1536ef2270b",
-        "revCount": 10,
-        "type": "git",
-        "url": "https://git.sr.ht/~rprospero/nixos-pia"
-      },
-      "original": {
-        "ref": "development",
-        "type": "git",
-        "url": "https://git.sr.ht/~rprospero/nixos-pia"
-      }
-    },
     "pre-commit-hooks-nix": {
       "inputs": {
         "flake-compat": [
@@ -983,7 +962,6 @@
         "nixpkgs": "nixpkgs_5",
         "nixpkgs-mautrix-signal": "nixpkgs-mautrix-signal",
         "nur": "nur",
-        "pia": "pia",
         "sops-nix": "sops-nix",
         "stylix": "stylix"
       }