Chore: Reorganize file structure

Author: GitauHarrison

README.md

@@ -62,9 +62,9 @@ This repository holds all the notes of the things I have learnt. Anyone else can
 - [Getting started with the Windows Subsystem for Linux](non_technical_articles/wsl.md)
 - [Integer conversion to binary using Python](non_technical_articles/convert_integers_to_binary_using_python.md)
 
-    ### Africa's Talking API
+    #### Africa's Talking API
 
-    - [Airtime API](at_airtime.md)
+    - [Airtime API](/africas_talking/at_airtime.md)
 
 ## Flask Demo Projects