Slightly flatten Emacs / language expressions

Move Python and Lua interpreter config up into Emacs default.nix, move
associated files (python external configs, scilua) up a level as
well. Remove JavaScript default install.

Add tkinter to default Python packages to fix plotting.

home/emacs/default.nix

@@ -4,12 +4,7 @@
   fonts,
   ...
 }: {
-  imports = [
-    ../shell/default.nix
-    ./python/default.nix
-    ./lua/default.nix
-    ./javascript/default.nix
-  ];
+  imports = [../shell/default.nix];
   services.emacs = {
     enable = true;
     package = config.programs.emacs.finalPackage;
@@ -167,5 +162,15 @@
     lua-language-server
     nodePackages.pyright
     nodePackages.typescript-language-server
+
+    ## Interpreters
+    (python3.withPackages
+      (ps: with ps; [tkinter numpy scipy xarray matplotlib]))
+    (luajit.withPackages
+      (ps: [(ps.callPackage ./luarocks/scilua.nix {})]))
   ];
+  xdg.configFile = {
+    "ruff/pyproject.toml".source = ./ruff.toml;
+    "pypoetry/config.toml".source = ./pypoetry.toml;
+  };
 }

home/emacs/javascript/default.nix

@@ -1,7 +0,0 @@
-{pkgs, ...}: {
-  home.packages = with pkgs;
-  with nodePackages; [
-    nodejs
-    typescript
-  ];
-}

home/emacs/lua/default.nix

@@ -1,7 +0,0 @@
-{pkgs, ...}: {
-  home.packages = with pkgs; [
-    (luajit.withPackages (ps: [
-      (ps.callPackage ./luarocks/scilua.nix {})
-    ]))
-  ];
-}

home/emacs/python/default.nix

@@ -1,17 +0,0 @@
-{pkgs, ...}: {
-  xdg.configFile = {
-    "ruff/pyproject.toml".source = ./ruff.toml;
-    "pypoetry/config.toml".source = ./pypoetry.toml;
-  };
-  home.packages = with pkgs; [
-    poetry
-    (python3.withPackages
-      (ps:
-        with ps; [
-          numpy
-          scipy
-          xarray
-          matplotlib
-        ]))
-  ];
-}