Update _config.yml

This commit comments out the theme variable since github
pages doesn't need it. The github pages builds the theme
from the remote_theme variable.

Signed-off-by: Venu Vardhan Reddy Tekula <[email protected]>

Author: vchrombie

_config.yml

@@ -18,7 +18,7 @@ exclude:
   - README.md
 
 # JUST THE DOCS CONFIG
-theme: "just-the-docs"
+# theme: "just-the-docs"
 remote_theme: pmarsceill/just-the-docs
 # color_scheme: "dark"