Clean out some packages from prog/default.nix

Remove default install of rustc and JS, trim python packages down to
jupyter with plugins. Move back to a nix-shell focused workflow

home/prog/default.nix

@@ -5,43 +5,30 @@
     nil
     alejandra
 
+    # Shell
+    shfmt
+    shellcheck
+
     # Lua
     (luajit.withPackages (ps: [(ps.callPackage ./luarocks/scilua.nix {})]))
     luarocks-nix
     lua-language-server
     stylua
 
-    # Python
-    (python3.withPackages
-      (ps:
-        with ps; [
-          python-lsp-server
-          mypy
-          jupyterlab
-          jupyterlab-git
-          (callPackage ./catppuccin_jupyterlab/default.nix {})
-        ]))
-    ruff
-
     # Fortran
     gfortran
     fortls
 
-    # Rust toolchain
-    rustc
-    rust-analyzer
-    cargo
-    rustfmt
-    clippy
+    # Python
+    ruff
 
-    # JavaScript / TypeScript
-    nodejs
-    nodePackages.typescript-language-server
-    nodePackages.eslint
-
-    # Shell and misc
-    shfmt
-    shellcheck
-    nodePackages.prettier
+    ## Python - JupyterLab
+    (python3.withPackages
+      (ps:
+        with ps; [
+          jupyterlab
+          jupyterlab-git
+          (callPackage ./catppuccin_jupyterlab/default.nix {})
+        ]))
   ];
 }