docs: add vendored licenses

scripts/concat_licenses.py

@@ -0,0 +1,14 @@
+from pathlib import Path
+
+def concat_license() -> str:
+    root = Path(__file__).resolve().parents[1]
+    licenses = root.joinpath("licenses")
+    combined = ""
+    for _dir in licenses.iterdir():
+        docs = _dir.glob("*.md")
+        doc = list(docs)[0]
+        header = f"\n--- The verbatim license for bundled dependency '{_dir.name}' follows ---\n\n"
+        combined += header
+        combined += doc.read_text()
+    return combined
+