Hide MBDT link from sidebar for 2.1.9 installer so as to prevent user from exploring MBDT in CIMMYT demo

Issue: GCP-9257

Reviewer: Mae
Revert "Hide MBDT link from sidebar for 2.1.9 installer so as to prevent user from exploring MBDT in CIMMYT demo"

This reverts commit bd9011ab0227bb6ed693fa7c43a5bf2174c88a8e.