README.adoc: add site map

Allow visitors to navigate to the other documents in the documentation.

README.adoc

@@ -1,12 +1,5 @@
 = AddressBook (Level 1)
 ifdef::env-github,env-browser[:relfileprefix: docs/]
-:toc:
-:toc-title:
-:toc-placement: preamble
-ifdef::env-github[]
-:tip-caption: :bulb:
-:note-caption: :information_source:
-endif::[]
 
 * This is a CLI (Command Line Interface) Address Book application *written in procedural fashion*.
 * It is a Java sample application intended for students learning Software Engineering while using Java as
@@ -16,12 +9,16 @@ usually write in data structure modules.
 * It can be used to achieve a number of beginner-level <<LearningOutcomes#, Learning Outcomes>> without
 running into the complications of OOP or GUI programmings.
 
+== Site Map
+
+* <<UserGuide#, User Guide>>
+* <<DeveloperGuide#, Developer Guide>>
+* <<LearningOutcomes#, Learning Outcomes>>
+
 == Contributors
 
 The full list of contributors for se-edu can be found https://se-edu.github.io/Team.html[here].
 
-'''''
-
 == Contact Us
 
 * *Bug reports, Suggestions*: Post in our https://github.com/se-edu/addressbook-level1/issues[issue tracker]