Doc rewrite update 3 - Serialize built in types (#3082)

* feat: adding the serialize built in types page

* update: implementing first round of review comments

* update: implementing second review round comments

* update: moving tip and removing objects

* fix: capitalization of Kotlin serialization for consistency

* update: implementing comments from Sarah for TWr review

* update: adding ids to the runnable examples

Author: daniCsorbaJB