refactor: split the repo into self-contained validator, directory, quickstart, spec and site folders

validator/ holds mewslint (lint, css, fetch, DTD/CSS data); directory/ holds
the mews.page service (app, db, check, pages, cli) and depends on validator/;
quickstart/ holds mews-quickstart and md2mews.py for third parties who want
to create Mews content without cloning the repo; spec/ consolidates doc/ and
dtd/ with the canonical mews-0.1.css; site/ becomes a Pelican project with
the forward-facing pages as Markdown, the check form kept as a raw HTML
snippet. Root pyproject.toml is now a virtual uv workspace over validator,
directory and quickstart, with cross-cutting tests that span more than one
of them staying at the repo root. Makefile and flake.nix updated to match.

directory/pyproject.toml

@@ -0,0 +1,33 @@
+[project]
+name = "mews-directory"
+version = "0.1.0"
+description = "The mews.page submission and listing service"
+authors = [{name = "Mews Profile developers"}]
+license = "Apache-2.0"
+requires-python = ">=3.12"
+dependencies = [
+    "mews",
+    "waitress>=3.0",
+]
+
+[tool.uv.sources]
+mews = { workspace = true }
+
+[project.scripts]
+mewsd = "directory.cli:main"
+
+[dependency-groups]
+dev = [
+    "pytest>=8.0",
+]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
+[build-system]
+requires = ["uv_build>=0.8"]
+build-backend = "uv_build"
+
+[tool.uv.build-backend]
+module-root = ""
+module-name = "directory"