Demo mode to simplify iambic setup

[smoy]

Is your feature request related to a problem? Please describe.
Often time, new users want to see IAMbic in action in a single AWS account. If they use the normal wizard, they will create the IambicHubRole and IambicSpokeRole in just one aws account. The later upgrade path may be painful since they have to ensure to delete the stacks in order to setup organization mode.

Describe the solution you'd like
When user is adding the first aws account using the wizard, prompts to use demo mode. If using demo mode, IAMbic can name the stack IambicHubRoleDemo and IambicSpokeRoleDemo. (concern would be the IAM roles IambicSpokeRole will still prevent the typical organization CF StacksSet creation)

Describe alternatives you've considered
Has wizard to detect existing single account setup and upgrade it to an organization setup. The implementation would have to do a lot in-place update or go through removal because assume role statement will be incopmatible on existing IambicSpokeRole

Additional context
As a first time user, I will be shy to set it up for the entire organization before it operate on a single account.

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