Add build script

.gitignore

@@ -1,4 +1,5 @@
 _build
 .venv
 .ipynb_checkpoints
-
+__pycache__
+out

build.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+from pathlib import Path
+import os
+import subprocess
+from typing import Literal
+
+BASE_DIR = Path(__file__).parent
+
+BUILD_DIR = BASE_DIR / "_build"
+OUT_DIR = BASE_DIR / "out"
+
+
+def run_build(language: Literal["de", "en"]):
+    toc_file = BASE_DIR / "_toc.yml"
+    if toc_file.exists():
+        assert toc_file.is_file()
+        toc_file.unlink()
+
+    os.symlink(BASE_DIR / f"_toc.{language}.yml", toc_file)
+    _ = subprocess.run(["jupyter-book", "build", "."])
+
+    toc_file.unlink()
+
+
+if __name__ == "__main__":
+    _ = subprocess.run(["rm", "-r", BUILD_DIR])
+    run_build("de")
+    _ = subprocess.run(["mv", BUILD_DIR, OUT_DIR])
+    run_build("en")
+    _ = subprocess.run(f"cp -r {BUILD_DIR}/* {OUT_DIR}/", shell=True)
+    _ = subprocess.run(["rm", "-r", BUILD_DIR])