Add Dockerfile and remove lume install from flake.nix that was causing version issues

Dockerfile

@@ -0,0 +1,7 @@
+FROM denoland/deno:alpine-1.26.1
+
+WORKDIR /site
+COPY . .
+RUN chown -R deno:deno .
+USER deno
+RUN deno task build

flake.nix

@@ -53,7 +53,6 @@
           ];
           bash.extra = ''
             export NVIM_USE_DENOLS=1
-            deno run -Ar https://deno.land/x/lume@v1.12.1/init.ts
           '';
         };
     };

shell.nix

@@ -0,0 +1,9 @@
+let
+  unstable = import (fetchTarball https://github.com/nixos/nixpkgs/archive/nixos-unstable.tar.gz) { };
+in
+{ nixpkgs ? import <nixpkgs> {} }:
+with nixpkgs; mkShell {
+  buildInputs = [
+  ];
+}
+