MVP get us working fully on nixos

NB: for now this is linking to a presumed local clone of the
`poetry2nix` repo since part of fixing what was adjusted here needs to
be patched upstream, which means hackin on the p2n repo in tandem B)

Since there's some dependency build issues we need
to tweak the following to get baseline `nix develop` working:
- drop `python-levenshtein` (required by `fuzzywuzzy[speedup]`) for now
  since the overlay and/or wheel install needs to be properly figured
  out.
- build `pyqt5` from src for the moment (since `preferWheel` doesn't
  seem to be workin?) despite it taking forever XD
- add in the `flake.lock` file.

flake.nix

@@ -14,9 +14,9 @@
 
   # see https://github.com/nix-community/poetry2nix/tree/master#api
   inputs.poetry2nix = {
-    url = "github:nix-community/poetry2nix";
+    # url = "github:nix-community/poetry2nix";
     # url = "github:K900/poetry2nix/qt5-explicit-deps";
-    # url = "/home/lord_fomo/repos/poetry2nix";
+    url = "/home/lord_fomo/repos/poetry2nix";
 
     inputs.nixpkgs.follows = "nixpkgs";
   };
@@ -57,17 +57,14 @@
           eventkit = [ "setuptools" ];
           ib-insync = [ "setuptools" "flake8" ];
           msgspec = [ "setuptools"];
-          tabcompleter = [ "setuptools" ];
           pdbp = [ "setuptools" ];
-          xonsh = [ "setuptools" ];
+          pyqt6-sip = [ "setuptools" ];
+          tabcompleter = [ "setuptools" ];
+          tractor = [ "setuptools" ];
+          tricycle = [ "setuptools" ];
           trio-typing = [ "setuptools" ];
           trio-util = [ "setuptools" ];
-          tricycle = [ "setuptools" ];
-          tractor = [ "setuptools" ];
-          pyqt6-sip = [ "setuptools" ];
-
-          # don't need these right?
-          # tomlkit = [ "setuptools" ];
+          xonsh = [ "setuptools" ];
         };
 
         # auto-generate override entries
@@ -121,10 +118,10 @@
 
                   # see PR from @k900:
                   # https://github.com/nix-community/poetry2nix/pull/1257
-                  pyqt5-qt5 = prev.pyqt5-qt5.override {
-                    withWebkit = false;
-                    preferWheel = true;
-                  };
+                  # pyqt5-qt5 = prev.pyqt5-qt5.override {
+                  #   withWebkit = false;
+                  #   preferWheel = true;
+                  # };
 
                   # TODO: patch in an override for polars to build
                   # from src! See the details likely needed from