Update contactUrl

Author: swaroopch

book.json

@@ -1,9 +1,9 @@
 {
     "title": "A Byte of Python",
     "variables": {
-        "authorUrl": "https://swaroopch.com/notes/about",
-        "buyBookUrl": "https://swaroopch.com/notes/buybook",
-        "contactUrl": "https://swaroopch.com/notes/about",
+        "authorUrl": "https://swaroopch.com/about/",
+        "buyBookUrl": "https://swaroopch.com/buybook/",
+        "contactUrl": "https://swaroopch.com/contact/",
         "downloadUrl": "https://github.com/swaroopch/byte-of-python/releases/latest",
         "officialUrl": "https://python.swaroopch.com",
         "pythonVersion": "3.6.0",