Removes duplication from the sidebar

The Presentation page contains the same content as the
Introduction page, hereby causing unnecessary duplication.
This commit corrects that by removing the Presentation page
from the sidebar.

References: #134
Signed-off-by: stevekola <[email protected]>

Author: stevenkolawole

_data/sidebars/home_sidebar.yml

@@ -9,12 +9,8 @@ entries:
     output: web
     folderitems:
 
-    - title: Presentation
-      url: /
-      output: web
-
     - title: Introduction
-      url: /README.html
+      url: /
       output: web
       subfolders: