Add troubleshooting section item in vi-planet-installation-vagrant.md for users who do not have VT-x enabled in bios.
Problem
When running vagrant up prod, it gives the following message: Stderr: VBoxManage: error: VT-x is disabled in the BIOS for all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)
Steps to reproduce the problem
Disable VT-x in the bios, then try to run vagrant up prod
Screenshots

Proposed solution
Add troubleshooting section item in vi-planet-installation-vagrant.md to inform users to enable VT-x in the bios.
any additional information about potential Virtualization bugs or errors could be very useful for some incoming interns. I had some issues with that myself and it can be very confusing.
I think a new section called common errors can be created which can list all the common errors that are faced while setting up the project.