Add Pre-Flight Checks to initial scripting

As a way to help users fall only into the "Pit of Success" (😂), it would be helpful to have some pre-flight checks run by the user, to ensure they have all the pieces in place before beginning to deploy. This could be Pester tests, or simple functions that check for certain prerequisites. This process could also be interactive, to get input from the end-user as well.

Some ideas for prerequisites to check for:
- Does the C4B Server have Internet access?
- Is it going to be **Internet-enabled**? If so:
- Do you have a **public IP**?
- Do you have a Fully-Qualified Domain Name (**FQDN**) resolving to that public IP?
- Do you have an **SSL certificate** with an **exportable private key** for this FQDN?