Improved the docs

mkdocs.yml

@@ -3,19 +3,20 @@ nav:
   - Home: index.md
   - Installation: installation.md
   - Getting Started: getting-started.md
-  - /start: start.md
-  - /legal: legal.md
-  - /play_lan: play-lan.md
-  - /heuristics: heuristics.md
-  - /undo: undo.md
-  - /accept: accept.md
-  - /takeback: takeback.md
-  - /draw: draw.md
-  - /resign: resign.md
-  - /leave: leave.md
-  - /rematch: rematch.md
-  - /restart: restart.md
-  - /stockfish: stockfish.md
-  - /stockfish_eval: stockfish-eval.md
-  - /online_games: online-games.md
+  - Commands:
+    - /start: start.md
+    - /legal: legal.md
+    - /play_lan: play-lan.md
+    - /heuristics: heuristics.md
+    - /undo: undo.md
+    - /accept: accept.md
+    - /takeback: takeback.md
+    - /draw: draw.md
+    - /resign: resign.md
+    - /leave: leave.md
+    - /rematch: rematch.md
+    - /restart: restart.md
+    - /stockfish: stockfish.md
+    - /stockfish_eval: stockfish-eval.md
+    - /online_games: online-games.md
 theme: readthedocs