get all of the elpy requirements into the environment

shell.nix

@@ -7,7 +7,11 @@ let
   inherit (privatestorage) pkgs mach-nix tahoe-lafs zkapauthorizer;
 
   python-env = mach-nix.mkPython {
-    inherit (zkapauthorizer.meta.mach-nix) python providers;
+    inherit (zkapauthorizer.meta.mach-nix) python;
+    providers = zkapauthorizer.meta.mach-nix.providers // {
+      jedi = "wheel";
+      parso = "wheel";
+    };
     overridesPre = [
       (
         self: super: {
@@ -17,6 +21,11 @@ let
     ];
     requirements =
       ''
+      pip
+      jedi
+      black
+      isort
+      flake8
       ${builtins.readFile ./docs/requirements.txt}
       ${builtins.readFile ./requirements/test.in}
       ${zkapauthorizer.requirements}
@@ -30,9 +39,6 @@ pkgs.mkShell {
   PYTHONDONTWRITEBYTECODE = "1";
 
   buildInputs = [
-    # Provide the linting tools for interactive usage.
-    lint-python
-    # Supply all of the runtime and testing dependencies.
     python-env
   ];
 }