Revert "Sync/main (#3)"

This reverts commit 92cc266.

chapters/de/_toctree.yml

@@ -3,30 +3,6 @@
   - local: chapter0/1
     title: Einführung
 
-- title: 1. Transformer-Modelle
-  sections:
-  - local: chapter1/1
-    title: Einführung
-  - local: chapter1/2
-    title: Natural Language Processing
-  - local: chapter1/3
-    title: Transformer-Modelle - wozu sind sie imstande?
-  - local: chapter1/4
-    title: Wie funktionieren Transformer-Modelle?
-  - local: chapter1/5
-    title: Encoder-Modelle
-  - local: chapter1/6
-    title: Decoder-Modelle
-  - local: chapter1/7
-    title: Sequence-to-Sequence-Modelle
-  - local: chapter1/8
-    title: Bias und Einschränkungen
-  - local: chapter1/9
-    title: Zusammenfassung
-  - local: chapter1/10
-    title: Quiz am Ende des Kapitels
-    quiz: 1
-
 - title: 3. Fine-tuning von vortrainierten Modellen
   sections:
   - local: chapter3/1