[docs] release 1.4.2+aws.2

[satya-dillikar]

Issue #, if available:

Description of changes:

• adding more use-cases to troubleshooting guide
• changing format to problem, cause & solution for each use-case
• added images to help navigate the user

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[satya-dillikar]

This PR needs to go in in tandem with https://github.com/aws-quickstart/quickstart-vmware-tanzu-application-platform/pull/154

[satya-dillikar]

@tlindsay42 , @jacnnguyen , please have a look! Thanks!

[satya-dillikar]

@davmayd , please merge in this as well.