feat(aspen/emacs): Begin a complete emacs config revamp

I'm still on doom, but without all the cruft I've accumulated over the
last ~6 years it's actually good and fast and nice. Also, the config is
literate now!

The old emacs is still in .emacs.d, since occasionally I want to
reference it, but eventually I'll just get rid of it

Change-Id: Icda840d798594f7e6b188dba044494597d5f6043
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10999
Reviewed-by: aspen <root@gws.fyi>
Tested-by: BuildkiteCI

users/aspen/emacs/snippets/nix-mode/fetchFromGitHub

@@ -0,0 +1,12 @@
+# -*- mode: snippet -*-
+# name: fetchFromGitHub
+# uuid: fetchFromGitHub
+# key: fetchFromGitHub
+# condition: t
+# --
+fetchFromGitHub {
+                owner = "$1";
+                repo = "$2";
+                rev = "$3";
+                sha256 = "0000000000000000000000000000000000000000000000000000";
+}

users/aspen/emacs/snippets/nix-mode/pythonPackage

@@ -0,0 +1,16 @@
+# key: pypkg
+# name: pythonPackage
+# condition: t
+# --
+${1:pname} = buildPythonPackage rec {
+           name = "\${pname}-\${version}";
+           pname = "$1";
+           version = "${2:1.0.0}";
+           src = fetchPypi {
+               inherit pname version;
+               sha256 = "0000000000000000000000000000000000000000000000000000";
+           };
+           propagatedBuildInputs = with pythonSelf; [
+               $3
+           ];
+};

users/aspen/emacs/snippets/nix-mode/sha256

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: sha256
+# uuid: sha256
+# key: sha256
+# condition: t
+# --
+sha256 = "0000000000000000000000000000000000000000000000000000";