add "fill" action to the CLI, consolidate config generation

scripts/prepare.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# usage: prepare.sh
+# synopsis: prepare repo with generated assets
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# write palette files
+mkdir -p colors
+uv run monobiome palette -n hex -f toml -o colors/hex-palette.toml
+uv run monobiome palette -n oklch -f toml -o colors/oklch-palette.toml
+
+# generate provided app config
+"$script_dir/generate.sh"