content restructuring

Author: sumn2u

book.json

@@ -8,7 +8,7 @@
     "website": "https://sumankunwar.com.np",
     "keywords": "learn JavaScript, Beginners lessons",
     "language": "en",
-    "totalpages": 239,
+    "totalpages": 240,
     "hidepageheaders": [1,2, 3, 10, 40],
     "hidepagefooters": [1,2, 3, 10, 40],
     "plugins": [
@@ -80,6 +80,10 @@
             "config": "np",
             "text": "नेपाली"
           },
+          {
+            "config": "de",
+            "text": "Deutsch"
+          },
           {
             "config": "tr",
             "text": "Türkiye"