Automating ngrok authentication retrival for configuration

[0xPrateek]

• Currently, while configuring dash we are asking the user to enter the authentication token manually.
• The Objective of this Issue is to automate this issue and in place of entering auth token we take Username and password of their Ngrok account and get the auth token automatically.
• When user does not pass any value to username and pass then ask them to enter authtoken after getting it manually.