Trim python config, switch to jedi-language-server

Reorganise layout a little bit too, purely cosmetic

home/prog/default.nix

@@ -1,8 +1,8 @@
 {pkgs, ...}: {
   home.packages = with pkgs; [
     # Nix
-    alejandra
     nil
+    alejandra
 
     # Lua
     lua
@@ -10,26 +10,20 @@
     stylua
 
     # Python
-    poetry
-    (python3.withPackages
-      (ps:
-        with ps; [
-          pyflakes
-          black
-          isort
-          mypy
-          python-lsp-server
-        ]))
+    python3
+    python3Packages.jedi-language-server
+    ruff
+    mypy
 
     # Fortran
     gfortran
     fortls
 
     # Rust toolchain
-    cargo
     rustc
-    rustfmt
     rust-analyzer
+    cargo
+    rustfmt
     clippy
 
     # JavaScript / TypeScript