german docs translation (#18544)

* Create _config.py

* Create _toctree.yml

* Create index.mdx

not sure about "du / ihr" oder "sie"

* Create quicktour.mdx

* Update _toctree.yml

* Update build_documentation.yml

* Update build_pr_documentation.yml

* fix build

* Update index.mdx

* Update quicktour.mdx

* Create installation.mdx

* Update _toctree.yml

docs/source/de/_config.py

@@ -0,0 +1,14 @@
+# docstyle-ignore
+INSTALL_CONTENT = """
+# Transformers installation
+! pip install transformers datasets
+# To install from source instead of the last release, comment the command above and uncomment the following one.
+# ! pip install git+https://github.com/huggingface/transformers.git
+"""
+
+notebook_first_cells = [{"type": "code", "content": INSTALL_CONTENT}]
+black_avoid_patterns = {
+    "{processor_class}": "FakeProcessorClass",
+    "{model_class}": "FakeModelClass",
+    "{object_class}": "FakeObjectClass",
+}